[ci skip] Prettify the removals from Action Controller in 4.1 release notes.
Merge pull request #13358 from JuanitoFatas/patch/release-notes

Prettify the removals from Action Controller in 4.1 release notes. [ci skip]
Add a failing test for assigning nil to a polymorphic belongs_to not nullifying its _type column
#none documentation updated [ci skip]
allow video_tag to accept `size` as `Number` for square shaped videos
typo: should be 'DateTime.civil_from_format' and not 'DateTime.civil_from_fromat'
Merge pull request #13364 from corprew/patch-1

typo: should be 'DateTime.civil_from_format' and not 'DateTime.civil_from_fromat'
Merge pull request #13363 from kuldeepaggarwal/f-video-options

allow video_tag to accept `size` as `Number` for square shaped videos
we should use annotated tags for releases.

Annotated tags will provide us with Tagger and Time information.
Use annotated git tags for release task
Merge pull request #13340 from akshay-vishnoi/typo

#none documentation updated [ci skip]
change to DateTime.civil_from_format from DateTime.civil_from_fromat in changelog [ci skip]
Merge pull request #13367 from abhishekjain16/new_branch

change to DateTime.civil_from_format from DateTime.civil_from_fromat in ...

[ci skip]
Added a link to the Module#concerning docs from the 4.1 release notes [ci skip]
Fix typo [ci skip]
Merge pull request #13373 from sbagdat/patch-1

Fix typo [ci skip]
duplication removed(DRY)
Merge pull request #13370 from abhishekjain16/refactor_rails

duplication removed(DRY)
Fix nil assignment to polymorphic belongs_to

Assigning nil to a polymorphic belongs_to would nullify its _id field by
not its _type field.

Fixes failing test from c141dfc838a5dca9f197814410fa5d44c143129c.
Regression from 1678e959e973de32287b65c52ebc6cce87148951.
document how to access mail previews. [ci skip]

/cc @pixeltrix