Fix proto link (#1002)

* Fix link to proto files

* Fix proto path.

docs/cn/Trace-Data-Protocol-CN.md

@@ -12,7 +12,7 @@ v1.1
 * 注册和数据上行服务同时支持gRPC和HTTP JSON服务
 
 #### gRPC协议定义文件
-[gRPC proto files](../../apm-protocol/apm-network/src/main/proto)
+[gRPC proto files](https://github.com/apache/incubator-skywalking-data-collect-protocol/tree/v1.1.1)
 
 ## Collector服务发现协议
 ### 简介
@@ -38,7 +38,7 @@ JSON数组，数组的每个元素，为一个有效的gRPC服务地址。
 此服务会在后续的传输过程中，有效降低网络带宽需求。
 
 ### 协议内容
-[gRPC service define](../..apm-protocol/apm-network/src/main/proto/ApplicationRegisterService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/ApplicationRegisterService.proto)
 
 - applicationCode为客户端设置的应用名.
 - applicationCode对应的返回id,在后续协议中，被称为applicationId。
@@ -51,14 +51,14 @@ JSON数组，数组的每个元素，为一个有效的gRPC服务地址。
 gRPC服务
 
 ### 实例注册服务
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/DiscoveryService.proto#L11-L12)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/DiscoveryService.proto#L29)
 
 - agentUUID 由探针生成，需保持唯一性，推荐使用UUID算法。并在应用重启前保持不变
 - applicationId 由**应用注册服务**获取。
 - 服务端返回应用实例id，applicationInstanceId 。后续上报服务使用实例id标识。
 
 ### 实例心跳服务
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/DiscoveryService.proto#L14-L15)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/DiscoveryService.proto#L32)
 
 - 心跳服务每分钟上报一次。
 - 如果一分钟内有segment数据上报，则可不必上报心跳。
@@ -68,7 +68,7 @@ gRPC服务
 服务名注册发现服务，是将应用内的服务名（operationName）替换为id的服务。
 
 ### 协议内容
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/DiscoveryService.proto#L53-L74)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/DiscoveryService.proto#L70)
 
 - 可选服务，可有效降低网络消耗，推荐实现。注意，由于部分应用存在URI中夹带参数的情况，请注意限制探针内的缓存容量，防止内存溢出。
 - ServiceNameElement中，applicationId为当前applicationCode对应的id。serviceName一般为对应span的operationName
@@ -78,7 +78,7 @@ gRPC服务
 地址注册发现服务，是将远程调用（RPC、MQ、DB...）地址的（addresses）替换为id的服务。
 
 ### 协议内容
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/NetworkAddressRegisterService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/NetworkAddressRegisterService.proto)
 
 - 可选服务，可有效降低网络消耗，推荐实现。
 - NetworkAddresses中，addresses为被调方的地址（IP/HOST:PORT）多个地址使用逗号分隔
@@ -88,14 +88,14 @@ gRPC服务
 上报当前实例的JVM信息，每秒上报一次。
 
 ### 协议内容
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/JVMMetricsService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/JVMMetricsService.proto)
 
 ## TraceSegment上报服务
 ### 简介
 上报调用链信息
 
 ### 协议内容
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/TraceSegmentService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/TraceSegmentService.proto)
 
 - UniqueId为segment或者globalTraceId的数字表示。由3个long组成，1）applicationInstanceId，2）当前线程id，3）当前时间戳*10000 + seq(0-10000自循环)
 - Span的数据，请参考[插件开发规范](Plugin-Development-Guide-CN.md)

docs/en/Trace-Data-Protocol.md

@@ -12,7 +12,7 @@ uplink data to the SkyWalking backend.
 v1.1
 
 #### gRPC proto files
-[gRPC proto files](../../apm-protocol/apm-network/src/main/proto)
+[gRPC proto files](https://github.com/apache/incubator-skywalking-data-collect-protocol/tree/v1.1.1)
 
 ## Collector discovery service
 ### Abstract
@@ -34,7 +34,7 @@ JSON Array. Each element in the array ia a valid gRPC service address.
 ### Abstract
 Register Application Code to the backend, and receive an integer represents the application.
 
-[gRPC service define](../..apm-protocol/apm-network/src/main/proto/ApplicationRegisterService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/ApplicationRegisterService.proto)
 
 - applicationCode is the config in your `agent.config`.
 - The return id is **ApplicationId** as the value in `KeyWithIntegerValue`, which will be used in further data uplink.
@@ -42,13 +42,13 @@ Register Application Code to the backend, and receive an integer represents the
 ## Discovery Service
 
 ### Register Instance Service
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/DiscoveryService.proto#L11-L12)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/DiscoveryService.proto#L29)
 
 - agentUUID generated by agent, should be unique. Stay same before reboot, at least.
 - **ApplicationInstanceId** will be used in further data uplink.
 
 ### Heart beat service
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/DiscoveryService.proto#L14-L15)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/DiscoveryService.proto#L32)
 
 - Recommend to report heart beat every 20-60 seconds.
 - Java agent don't use this, because JVM metrics upstream replace the capabilities of this. 
@@ -57,7 +57,7 @@ Register Application Code to the backend, and receive an integer represents the
 ### Abstract
 Replace the literal String service(operation) name by an id(integer)
 
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/DiscoveryService.proto#L53-L74)
+[gRPC service define](.https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/DiscoveryService.proto#L70)
 
 - Optional service, reduce the network cost but use more memory as a buffer mapping.
 
@@ -65,7 +65,7 @@ Replace the literal String service(operation) name by an id(integer)
 ### Abstract
 Network Address includes all remove service address, includes ip, port, hostname, etc., which used in RPC framework, MQ, DB, etc.
 
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/NetworkAddressRegisterService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/NetworkAddressRegisterService.proto)
 
 - Optional service, reduce the network cost but use more memory as a buffer mapping.
 
@@ -73,10 +73,10 @@ Network Address includes all remove service address, includes ip, port, hostname
 ### Abstract
 Uplink the JVM metrics, including PermSize, HeapSize, CPU, Memory, etc., every second.
 
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/JVMMetricsService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/JVMMetricsService.proto)
 
 ## Trace Segment Service
-[gRPC service define](../../apm-protocol/apm-network/src/main/proto/TraceSegmentService.proto)
+[gRPC service define](https://github.com/apache/incubator-skywalking-data-collect-protocol/blob/v1.1.1/TraceSegmentService.proto)
 
 - UniqueId represents segmentId and globalTraceId. It have 3 parts(Longs), 1) applicationInstanceId, 2) ThreadId, 3) Timestamp + 10000 + seq(seq is in [0, 100000) )
 - Span data please refs to [Plugin Development Guide](Plugin-Development-Guide.md)