* ext/bigdecimal/*: improve documentation, nodoc samples with @mrkn


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41287 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* bignum.c (bigdivrem): Zero test condition simplified.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41288 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-06-14

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41289 b2dd03c8-39d4-4d8f-98ff-823fe69b080e