Ruby

unstable sort [ci skip]

• array.c (rb_ary_sort_bang, rb_ary_sort, rb_ary_sort_by_bang):
  [DOC] describe that sort may not be stable.
• enum.c (enum_sort, enum_sort_by): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56413 b2dd03c8-39d4-4d8f-98ff-823fe69b080e