[MASSEMBLY-822] Incorrect outputDirectory on multi module example

**[Daniel Widdis](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=dbwiddis)** opened **[MASSEMBLY-822](https://issues.apache.org/jira/browse/MASSEMBLY-822?redirect=false)** and commented

The plugin website's [Including Module Binaries](http://maven.apache.org/plugins/maven-assembly-plugin/examples/multimodule/module-binary-inclusion-simple.html) example includes this line:

`modules/maven-assembly-plugin`

This is incorrect. I believe (but am not sure) it should be similar to the multi-module source example, which is:

`sources/${artifactId}`

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**Remote Links:**
- [GitHub Pull Request #11
](https://github.com/apache/maven-assembly-plugin/pull/11)

Open the linked Including Module Binaries example on the Maven Assembly Plugin website and compare its outputDirectory with the multi-module source example cited in the issue. Check the linked pull request for the current proposed resolution; done means the published example uses the correct directory and remains consistent with the source example.

Written by the indexing model from the issue text.