Add tip about using RDoc's --pipe command to quickly test the output of
a piece of documentation.

This can be useful for trying out combinations of markup and code, as
discussed in rails/rails@225bcad
Updated doc for default scope [ci skip]
Tell default_scope are prepended [ci skip]
Fix parameter naming in RemoteIp middleware constructor method

Was custom_proxies in inline docs, but should be and defined in
constructor as custom_proxies
Aesthetic [ci skip]
Doc: assets:precompile:all was removed on 4 [skip ci]
Added Object#present_in to simplify value whitelisting
Merge pull request #14096 from arthurnn/precompile_all

Upgrade Doc: assets:precompile:all was removed on 4
Use assert_nil instead as its clearer about what the return is expected to be
Minor grammar/punctuation fixes [ci skip]
Move changelog entry to the top, fix examples indent [ci skip]
Merge pull request #14094 from kalabiyau/fix_parameters_naming

Fix parameter naming in RemoteIp middleware constructor method [ci skip]
Document the default scopes change on the release notes, CHANGELOG
and upgrating guides

[ci skip]
Fix the column name [ci skip]
Don't use `# =>` when it is not the expression values

[ci skip]
Merge pull request #14095 from rails/rm-scopes

Document `default_scope` changes
Introduce `render :body` for render raw content

This is an option for sending a raw content back to browser. Note that
this rendering option will unset the default content type and does not
include "Content-Type" header back in the response.

You should only use this option if you are expecting the "Content-Type"
header to not be set. More information on "Content-Type" header can be
found on RFC 2616, section 7.2.1.

Please see #12374 for more detail.
Update hash format for render_text_test
Introduce `render :plain` for render plain text

This is as an option to render content with a content type of
`text/plain`. This is the preferred option if you are planning to render
a plain text content.

Please see #12374 for more detail.
Introduce `render :html` for render HTML string

This is an option for to HTML content with a content type of
`text/html`. This rendering option calls `ERB::Util.html_escape`
internally to escape unsafe HTML string, so you will have to mark your
string as html safe if you have any HTML tag in it.

Please see #12374 for more detail.