[DOC] Please see _the_ official issue tracker... [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46423 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

CONTRIBUTING.md

-Please see [official issue tracker] and wiki [HowToContribute].
+Please see the [official issue tracker] and wiki [HowToContribute].
 
 [official issue tracker]: https://bugs.ruby-lang.org
 [HowToContribute]: https://bugs.ruby-lang.org/projects/ruby/wiki/HowToContribute