Add link to runtime enabled features wiki documentation
Add link to runtime enabled features wiki documentation

TBR=abarth@chromium.org
NOTRY=true
BUG=None

Review URL: https://chromiumcodereview.appspot.com/17583020

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152986 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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