* vm.c: Typo in ObjectSpace::WeakMap overview [Backport #7933]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39452 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* thread.c: Documentation for Thread#backtrace_locations
  [Backport #7932]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39453 b2dd03c8-39d4-4d8f-98ff-823fe69b080e