Update references to wycats/thor to erikhuda/thor.
Merge pull request #12329 from benmanns/docrails

Update references to wycats/thor to erikhuda/thor.
Deprecate unused quoted_locking_column method.
Getting Started Guide: update RubyGems Guides link [ci skip]
Merge pull request #12335 from francisgo/patch-1

Getting Started Guide: update RubyGems Guides link [ci skip]
Merge pull request #11423 from kennyj/remove_quoted_locking_column

Remove unused quoted_locking_column method.