A warning line should look like a warning section

[ci skip]
[ci skip] Add Doc of with_options for the case when inherited default options and original options have same keys
atomic_write rescue also Errno::EACCES

atomic_write rescue also Errno::EACCES on changing file permission. It could be raised with some type of filesystem
Merge pull request #17230 from robertoz-01/master

atomic_write rescue also Errno::EACCES
Revert "Merge pull request #17247 from igas/fix-deprecations"

This reverts commit 997f1575f78bf6a2d12b8665a55807d51fe964df, reversing
changes made to f919d5f5ea75f0e56a57643e5a0472367a98625f.

See https://github.com/rails/rails/pull/17247#issuecomment-58895078
Document the propose of tools/profile
Do not use deprecated `exists?` method
Make a note about the internal tools/ dir and what each utility does
line_statistics is not an executable

Also add documentation on it
Autosave callbacks shouldn't be `after_save`

068f092ced8483e557725542dd919ab7c516e567 registered autosave callbacks
as `after_save` callbacks. This caused the regression described in #17209.

Autosave callbacks should be registered as `after_update` and
`after_create` callbacks, just like before.

This is a partial revert of 068f092ced8483e557725542dd919ab7c516e567.

Fixes #17209.
Merge pull request #17232 from Agis-/issue-17209

Autosave callbacks shouldn't be `after_save` callbacks
add length to ActiveRecord::Result
Don't need to account turbolinks cookies in get request.

It was changed to not set the cookie in get requests at
https://github.com/rails/turbolinks/commit/62cc3db457ad9745ccda047dd43ab84fb3d89707.

Related with dcb05f26.
Always use latest turbolinks
measure record instantiation time in AS::Notifications

emit an event when we instantiate AR objects so we can see how many
records were instantiated and how long it took
Remove duplicate error message "Couldn't find..."

This commit removes the duplication of the error message:

> Couldn't find #{@klass.name} with [#{arel.where_sql}]

introduced in #15791 by adding a private method `find_nth!` that
deals with all the method like `first!` and `second!`.
Merge pull request #17251 from claudiob/remove-duplicate-exception

Remove duplicate error message "Couldn't find..."
Clarify `#update_all` doc about value processing

This clarify the fact that `#update_all` doesn't type-cast passed
values and that these values are written as-is in the SQL DB.

Fix #17242

[ci skip]
Add #key? to ActiveModel::Errors

Mirror Ruby's Hash#key?
Merge pull request #17252 from Bounga/update_all_doc_clarification

[ci skip] Clarify `#update_all` doc about values processing