Start adding docs for PAST::Pattern::Node.
Start adding docs for PAST::Pattern::Node.


git-svn-id: 9e979cd1d8a5afe7d5b96591165ee66604ad4fe8@47636 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

ekiru/tree-optimization,ekiru/tree-optimization,parrot/tree-optimization,parrot/tree-optimization