start the first line of a commit with '(doc)' instead of a ticket number.

Additional Resources
--------------------

+ [Contributing patches](https://maven.apache.org/guides/development/guide-maven-development.html#Creating_and_submitting_a_patch)
+ [Apache Maven JIRA project page](https://issues.apache.org/jira/projects/MNG/)
+ [Contributor License Agreement][cla]

[dev-ml-list]: https://www.mail-archive.com/******@****.***/
[code-style]: http://maven.apache.org/developers/conventions/code.html
[core-it]: https://maven.apache.org/core-its/core-it-suite/
[building-maven]: https://maven.apache.org/guides/development/guide-building-maven.html

 * {{{./extension.html}extension descriptor}} and {{{./core-extensions.html}core extensions}},

 * {{{/guides/mini/guide-maven-classloading.html}classloader hierarchy}} done by <<<ClassRealmManager>>> component
 ({{{./apidocs/org/apache/maven/classrealm/ClassRealmManager.html}javadoc}}),
 with its <<<DefaultClassRealmManager>>> implementation

            For more information see http://maven.apache.org/plugin-developers/index.html

            The following plugins are ordered according the Maven build lifecycle.
            http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html
            -->
            <plugin>
                <!--
                Checks that the version of user's maven installation is 3.0.4,