[ci skip] Close the meta tag with '/>' instead of '>'

This change fixes the 42 instances of `end tag for "meta" omitted, but
OMITTAG NO was specified` error message that comes up when the full
railsguides are validated.

Full error list at
https://gist.github.com/prakashmurthy/9086679.
Pointing to latest guides [ci skip]
Merge pull request #14124 from arthurnn/fix_14116

Fix collection proxy exists? regression
Revert "context in validation goes through has many relationship"

This reverts commit 5e3d466d52fa4e9a42c3a1f8773a7c31da875e48.
adding a test for #14106
releasing Rails no longer needs triggering docs generation by hand [ci skip]

GitHub is now able to notify tag creation, I have configured the webhook
for the docs server to receive that event. Therefore, we no longer need
to trigger docs generation manually when releasing.
Revert "Only lookup `config.log_level` for stdlib `::Logger`. Closes #11665."

This reverts commit e0a521cfcd13e4d1f0ae8ab96004289e1c020f71.

Conflicts:
	railties/CHANGELOG.md

We expect loggers to quack like stdlib logger. If log4r needs different
level= assignment, using a Logger-quacking wrapper is the way to do it.

Fixes #14114.
Merge pull request #14140 from WojtekKruszewski/optimize_foreign_key_for

Prevent foreign_key_for? from evaluating all attributes
Add tests for default scope behaviour change

See #13875
Go with #presence_in instead of #present_in -- it doesnt sound quite as good, but the closer relationship to #presence over #present is ultimately worth it
Wups, committed the Gemfile change by mistake
Extract local cache middleware

Extract LocalCache Middleware, so it can requires rack dependencies,
without adding rack dependencies to `AS::Cache::Strategy::LocalCache`.
Merge pull request #14170 from kritik/master

there could be more than 10 nested records
Merge pull request #14179 from arthurnn/14171_backport

[backport] Extract local cache middleware
`ActionDispatch::Head` was replaced by `Rack::Head`. Closes #14191.

See 449039a86d802871b707dfb51ac1ed96d53526f9 for the original commit.
Merge pull request #14182 from mecampbellsoup/fix_typo_in_url_helper_docs

[skip ci] Fixing typo in documentation: actionview/lib/action_view/helpers/url_helper.rb
Merge pull request #14098 from Amit-Thawait/master

Typo fix for unscope [ci skip]
Merge pull request #14099 from robertomiranda/render-text-2-plain

Update Docs in favor to use render plain instead of text option
Fix render plain docs example in AM::Base

The errors were introduced in e220a34e39
Merge pull request #14120 from gregmolnar/guides

change 'assert !' to 'assert_not' in guides [ci skip]