Fix grammar in Qualified Constants section [ci skip]

New wording is based on the "cref" sentence earlier in the section.

[ci skip]

Improvements about schema dumping [ci skip]

Add a margin to body and padding to th, td in scaffold.css.

Add space to new css defs.

Doc: run bundle update after cloning Rails.

Update option to skip test in generators

Fixed AR::Relation#group method when argument is a SQL reserved keyword

Use kwargs in ActionController::TestCase and ActionDispatch::Integration HTTP methods

Non-kwargs requests are deprecated now.
Guides are updated as well.

`post url, nil, nil, { a: 'b' }` doesn't make sense.
`post url, params: { y: x }, session: { a: 'b' }` would be an explicit way to do the same

Preserve default format when generating URLs

Add fix for loading fixtures in engine tests (additional fix for #4971)

Conflicts:
	railties/lib/rails/generators/rails/plugin/templates/test/test_helper.rb

Module#const_defined? accepts constant paths in modern Ruby, we no longer
need our qualified_* extensions.

References #17845.

Fixes #18717

All columns which would map to a string primitive need this behavior.
Binary has it's own marker type, so it won't go through this conversion.
String and text, which need this, will.

Fixes #18585.

Fixes an issue that would cause default_url_options to be lost when generating
URLs with fewer positional arguments than parameters in the route definition.

    Post.where('id = 1').or(Post.where('id = 2'))
    # => SELECT * FROM posts WHERE (id = 1) OR (id = 2)

[Matthew Draper & Gael Muller]

Deprecate *_via_redirect integration test methods

table name should be plural

Fix ActiveJob assertions with a GlobalID object argument

These callbacks will already have been defined when the association was
built. The check against `reflection.autosave` happens at call time, not
at define time, so simply modifying the reflection is sufficient.

Fixes #18704

Add `ActiveSupport::Testing::FileFixtures`.