A warning line should look like a warning section

[ci skip]
Cleanup loaded features and constants after dependency tests.
Explicit route test class

shows the class that the test must extend in order to have the assert_routing method available
[ci skip] Add Doc of with_options for the case when inherited default options and original options have same keys
Fix that a collection proxy could be cached before the save of the owner, resulting in an invalid proxy lacking the owner’s id.

Absent this fix calls like: owner.association.update_all to behave unexpectedly because they try to act on association objects where
owner_id is null.

more evidence here: https://gist.github.com/Empact/5865555
```
Active Record 3.2.13
-- create_table(:firms, {:force=>true})
   -> 0.1371s
-- create_table(:clients, {:force=>true})
   -> 0.0005s
1 clients. 1 expected.
1 clients updated. 1 expected.
```

```
Active Record 4.0.0
-- create_table(:firms, {:force=>true})
   -> 0.1606s
-- create_table(:clients, {:force=>true})
   -> 0.0004s
1 clients. 1 expected.
0 clients updated. 1 expected.
```
Allow authentication header to not have to specify 'token=' key.

Fixes: https://github.com/rails/rails/issues/17108.
FileHandler should not be called for files outside the root

FileHandler#matches? should return false for files that are outside the
"root" path.
ActionController::InvalidCrossOriginRequest fails with 422 instead of 500
Fixes #15967
Use `#tr` instead of `#gsub`

`#tr` is more efficient than `#gsub` and can be used as a drop in
replacement in this context.
delete leftover JoinOperation struct
Add ActiveJob to "Welcome to Rails" section

[ci skip]
Link to ActiveModel’s README in "Welcome to Rails"

A link to the README of each module is included in "Welcome to Rails",
only ActiveModel (and ActiveJob, see #17264) are missing.

[ci skip]
Remove broken http://tore.darell.no link

Replace with Twitter account, unless @toretore has a better
suggestion :ear since http://tore.darell.no returns 404.

[ci skip]
Raise an error for has_one associations which try to go :through a polymorphic association [#17263]
specify protocol for external links

to ensure correct parsing result of rdoc
Merge pull request #17270 from neumanrq/fix/external_links_to_json_project

specify protocol for external links to json project
Merge pull request #17266 from claudiob/fix-broken-tore-darell-link

Remove broken http://tore.darell.no link
Merge pull request #17265 from claudiob/add-link-to-active-model-readme

Link to ActiveModel’s README in "Welcome to Rails"
Merge pull request #17264 from claudiob/add-activejob-to-readme

Add ActiveJob to "Welcome to Rails" section
Merge pull request #17257 from Bounga/use_tr_instead_of_gsub_in_journey_scanner

Use `#tr` instead of `#gsub` in Journey scanner