add documentation for maven shared components like other parent poms
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Key: MPOM-24
URL: https://issues.apache.org/jira/browse/MPOM-24
Project: Maven POMs
Issue Type: Wish
Components: maven-shared-components
Affects Versions: MAVEN-SHARED-16
Reporter: Hervé Boutemy
Assignee: Hervé Boutemy
Fix For: MAVEN-SHARED-17
to be published to http://maven.apache.org/pom/maven-shared-components/
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