am 575c2a63: Merge "Fix and improve Matcher.group(int) documentation." into gingerbread

Merge commit '575c2a638dd8ad8ca4a548b394bd3a938ab49c1d' into gingerbread-plus-aosp

* commit '575c2a638dd8ad8ca4a548b394bd3a938ab49c1d':
  Fix and improve Matcher.group(int) documentation.