numeric.c: rb_int_powm rdoc
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61057 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
numeric.c: rb_int_powm rdoc
defined in bignum.c. [Feature #12508] [Feature #11003]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61057 b2dd03c8-39d4-4d8f-98ff-823fe69b080e