replace Fixnum with Integer in rdoc [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
replace Fixnum with Integer in rdoc [ci skip]
directly to use Integer, as Fixnum and Bignum are now unified
into Integer and direct usage is deprecated. [Fix GH-1459]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e