modify launch link address to Apache (#1286)

docs/cn/Deploy-backend-in-cluster-mode-CN.md

@@ -5,7 +5,7 @@
 - Zookeeper 3.4.10
 
 ## 下载发布版本
-- 前向[发布页面](https://github.com/apache/incubator-skywalking/releases)
+- 前向[发布页面](http://skywalking.apache.org/downloads/)
 
 ## 部署Elasticsearch
 - 修改`elasticsearch.yml`文件

docs/cn/Deploy-backend-in-standalone-mode-CN.md

@@ -9,7 +9,7 @@
 - JDK8+
 
 ## 下载发布版本
-- 前向[发布页面](https://github.com/apache/incubator-skywalking/releases)
+- 前向[发布页面](http://skywalking.apache.org/downloads/)
 
 ## Quick Start
 Collector单机模拟启动简单，提供和集群模式相同的功能，单机模式下除端口(8080, 10800, 11800, 12800)被占用的情况下，直接启动即可。

docs/cn/Deploy-skywalking-agent-CN.md

 ## 下载skywalking探针发布版本
-- 前向[发布页面](https://github.com/apache/incubator-skywalking/releases)
+- 前向[发布页面](http://skywalking.apache.org/downloads/)
 
 ## 部署探针
 1. 拷贝skywalking-agent目录到所需位置，探针包含整个目录，请不要改变目录结构

docs/en/Deploy-backend-in-cluster-mode.md

@@ -5,7 +5,7 @@
 - Zookeeper 3.4.10
 
 ## Download released version
-- Go to [released page](https://github.com/apache/incubator-skywalking/releases)
+- Go to [released page](http://skywalking.apache.org/downloads/)
 
 ## Deploy Elasticsearch server
 - Modify `elasticsearch.yml`

docs/en/Deploy-backend-in-standalone-mode.md

@@ -9,7 +9,7 @@ If you are using SkyWalking in a low throughputs monitoring scenario, and don't
 * JDK 8+
 
 ## Download
-* [Releases](https://github.com/apache/incubator-skywalking/releases)
+* [Releases](http://skywalking.apache.org/downloads/)
 
 ## Quick start
 You can simply tar/unzip and startup if ports 8080, 10800, 11800, 12800 are free.

docs/en/Deploy-skywalking-agent.md

 ## Download skywalking agent release version
-- Go to [release page](https://github.com/apache/incubator-skywalking/releases)
+- Go to [release page](http://skywalking.apache.org/downloads/)
 
 ## Deploy skywalking javaagent
 1. Copy the agent package to anywhere you like. The logs, plugins and config are all included in the package.