[ROCKETMQ-62] Polish build instructions

BUILDING

@@ -34,4 +34,4 @@ Then, import to eclipse by specifying the root directory of the project via:
 
 Execute the following command in order to build the tar.gz packages and install JAR to the local repository:
 
-$ mvn clean package install assembly:assembly -U
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+$ mvn clean package install -Prelease-all assembly:assembly -U
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