Update add-flex-template.md (#2047)

contributor-docs/add-flex-template.md

@@ -348,11 +348,11 @@ such as missing JavaDocs.
 Once formatted, you can run (from the project's root as well):
 
 ```shell
-mvn clean package -pl v2/wordcount -am -Dmaven.test.skip
+mvn clean install -pl v2/wordcount -am -Dmaven.test.skip
 ```
 
 The `-am` option guarantees that all the necessary local dependencies are
-included in the build.
+included in the build. You can ignore the error releated to `v2/wordcount` if any error occurs.
 
 `-pl v2/wordcount` is how we specify the target module, allowing us to only
 build what we need. You can see all the available modules in the