[MCOMPILER-521] Documentation: <exclude> option

**[Kevin A Shaw](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=hephaestus)** opened **[MCOMPILER-521](https://issues.apache.org/jira/browse/MCOMPILER-521?redirect=false)** and commented

I am working with a multi-module project and need to exclude some source-directories from compilation for only one module (StackOverFlow [posting](https://stackoverflow.com/questions/75120440/excluding-source-directory-in-maven)).  I have seen [examples](https://coderanch.com/t/745331/java/Excluding-java-files-Maven-build) suggesting that the `maven-compiler-plugin` can exclude directories with the following code.  

I have searched the Apache Maven documentation ([link](https://maven.apache.org/plugins/maven-compiler-plugin/index.html)) but this is never mentioned.  Is this actually a supported option?  If so, could a reference to it be added to the documentation.  It would make searching on it so much easier.  {{}}

```java

maven-compiler-plugin
3.8.0


/com/company/conflict-dir/

```

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No further details from [MCOMPILER-521](https://issues.apache.org/jira/browse/MCOMPILER-521?redirect=false)

Start with the maven-compiler-plugin documentation linked in the issue and verify whether the shown configuration is supported. Done means adding a clear reference to the option and its usage to the relevant documentation, if confirmed.

Written by the indexing model from the issue text.