[Jackrabbit Wiki] Trivial Update of "mix:versionable" by HiteshLad

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The following page has been changed by HiteshLad:
http://wiki.apache.org/jackrabbit/mix%3aversionable

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  This is the key type of the JCR versioning system. All versionable nodes have the ["mix:versionable"] mixin type.
  
- All versionable nodes must also be referenceable, thus ["mix:versionable"] is a subtype of ["mix:versionable"]. There are no other constraints on the content or structure of the versionable nodes.
+ All versionable nodes must also be referenceable, thus ["mix:versionable"] is a subtype of ["mix:referenceable"]. There are no other constraints on the content or structure of the versionable nodes.
  
  A versionable node has a corresponding ["nt:versionHistory"] node within the {{{/jcr:system/jcr:versionStorage}}} tree. The {{{jcr:baseVersion}}} property references the ["nt:version"] node that represents the base version of this node within the version history.