node.c: Fix format and example of NODE_OPCALL
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63393 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
node.c: Fix format and example of NODE_OPCALL
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63393 b2dd03c8-39d4-4d8f-98ff-823fe69b080e