fix typos

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40696 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* include/ruby/ruby.h: fix a typo

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40697 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Merge remote-tracking branch 'origin/trunk' into rgengc
remove SUNNY/SHADY terminology except from gc.c.