fixed version 21 link

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk/maven@1157978 13f79535-47bb-0310-9956-ffa450edef68
1 file changed
tree: c63098a05d5eaca8bf0b35f9bd6b954dd5fdc20a
  1. src/
  2. pom.xml
  3. site-pom.xml