merge revision(s) 39817: [Backport #8116]

	* ext/objspace/objspace.c: Fix typo in doc. Patch by Sho Hashimoto.
	  [Bug #8116] [ruby-dev:47177]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@40297 b2dd03c8-39d4-4d8f-98ff-823fe69b080e