[SUREFIRE-1867] Java Modularity documentation creates error

**[Lee Rhodes](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=leerho)** opened **[SUREFIRE-1867](https://issues.apache.org/jira/browse/SUREFIRE-1867?redirect=false)** and commented

[Using Java Modularity]([https://maven.apache.org/surefire/maven-surefire-plugin/examples/jpms.html)] instructs the user to place a _module-info.java_ file under both src/main/java and src/test/java.  This duplication causes the error:

* The project was not built due to "Build path contains duplicate entry: 'module-info.java' for project 'Foo'"

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**Affects:** 3.0.0-M5

Start with the “Using Java Modularity” page linked in the issue and review its instructions for module-info.java under src/main/java and src/test/java. Confirm the duplicated placement produces the reported build-path error; done means the documentation no longer instructs users to create the conflicting duplicate.

Written by the indexing model from the issue text.