Update How-to-build.md (#4568)

Modify Eclipse and IDEA  steps

docs/en/guides/How-to-build.md

@@ -76,7 +76,7 @@ We can build docker images of `backend` and `ui` with `Makefile` located in root
 Refer to [Build docker image](../../../docker) for more details.
 
 ## Setup your IntelliJ IDEA
-**NOTICE**: If you clone the codes from GitHub, please make sure that you had finished step 1 to 7 in section **[Build from GitHub](#build-from-github)**, if you download the source codes from the official website of SkyWalking, please make sure that you had followed the steps in section **[Build from Apache source code release](#build-from-apache-source-code-release)**.
+**NOTICE**: If you clone the codes from GitHub, please make sure that you had finished step 1 to 3 in section **[Build from GitHub](#build-from-github)**, if you download the source codes from the official website of SkyWalking, please make sure that you had followed the steps in section **[Build from Apache source code release](#build-from-apache-source-code-release)**.
 
 1. Import the project as a maven project
 1. Run `./mvnw compile -Dmaven.test.skip=true` to compile project and generate source codes. Because we use gRPC and protobuf.
@@ -89,7 +89,7 @@ Refer to [Build docker image](../../../docker) for more details.
     * `antlr4` folder in **oap-server/oal-grammar/target/generated-sources**
     
 ## Setup your Eclipse IDE
-**NOTICE**: If you clone the codes from GitHub, please make sure that you had finished step 1 to 7 in section **[Build from GitHub](#build-from-github)**, if you download the source codes from the official website of SkyWalking, please make sure that you had followed the steps in section **[Build from Apache source code release](#build-from-apache-source-code-release)**.
+**NOTICE**: If you clone the codes from GitHub, please make sure that you had finished step 1 to 3 in section **[Build from GitHub](#build-from-github)**, if you download the source codes from the official website of SkyWalking, please make sure that you had followed the steps in section **[Build from Apache source code release](#build-from-apache-source-code-release)**.
 
 1. Import the project as a maven project
 1. For supporting multiple source directories, you need to add the following configuration in `skywalking/pom.xml` file: