updating the security links, they were removed in cc30f5f9 [ci skip]

new links as per pull request comment #20160 (OWASP guides)

Fix typos is CHANGELOG [ci skip]

The feature was accepted and added to Ruby 2.3+ so we don't need to
define it again.

See https://bugs.ruby-lang.org/issues/11151

Move Integer#positive? and Integer#negative? query methods to Numeric

Fix grammar. [CI SKIP]

Add schema cache to new connection pool after fork

Added ActionDispatch::Journey::Routes#empty?

Refactoring `ActiveRecord::Type::Integer` limit

Divide methods for handling column options separately

Fix `serial?` with quoted sequence name

docs for updating nested attributes while creating parent record

skip]

We must account for receiving one less call to #new_connection, but the
test otherwise remains valid.

This patch
  - reduces the duplication among the `reference`-family methods.
  - better explains all the optians available for `add_reference`.
  - redirects to user from `references` to `add_reference`.

Originated by #20184.

[ci skip] remove `assigns` from the integration test example in API docs

Based on #19976 and #18305.

config.generators javascript_engine default value is :js not nil

formatting changes for mail options

add missing documentation about generators resource_route [ci skip]

[ci skip] remove unnecessary mention to Test::Unit from docs

Fix the guide to state that Rails uses Minitest as the default test
framework.

Remove unnecessary mention to Test::Unit from the API docs
('constantize' and 'safe_constantize').

Active Record detects when the process has forked and automatically
creates a new connection pool to avoid sharing file descriptors.

If the existing connection pool had a schema cache associated with it,
the new pool should copy it to avoid unnecessarily querying the database
for its schema.

The code to detect that the process has forked is in ConnectionHandler,
but the existing test for it was in the ConnectionManagement test file.
I moved it to the right place while I was writing the new test for this
change.

[ci skip] Improve grammar/syntax in AR validations docs.

 Pass over CHANGELOGS [ci skip]

Reducing AR::ConPool's critical (synchronized) section