docs, configurations method is listed in the docs. [ci skip]

The :singleton-method: directive is printed in the docs.
This directive is not necessary as the method is documentable just fine.
Make dependencies.rb add a name to NameError
Add regression test for NameError#name
Merge pull request #15764 from arthurnn/dependencies_name_error

Make dependencies.rb add a name to NameError
[ci skip] Add Tip for change_column_null and change_column_default in guides
Merge pull request #15624 from aditya-kapoor/add-warnings-on-guides

[ci skip] Add Tip for change_column_null and change_column_default in guides
:nail_care: wrap the tip from #15624 at 80 chars [ci skip]