merge revision(s) 39414:

	* object.c (rb_obj_comp): Documenting Object#<=> return values
	  Patch by Stefan Rusterholz


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39663 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 39415:

	* array.c (rb_ary_diff, rb_ary_and, rb_ary_or): Document return order
	  [RubySpec #7803]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39664 b2dd03c8-39d4-4d8f-98ff-823fe69b080e