Add rake test description

No behavior change
Simplify code in AS json encoder
Changed update_record to use prepared statements.
Add CHANGELOG entry for 41ff6a10216f48f43605a1f9cd6094765cab750f

[ci skip]
add tests for ActiveRecord::Base#create
Merge pull request #9312 from Takehiro-Adachi/add_tests_for_ar_create

Add test for ActiveRecord::Base#create
Return false on toggle on error pages
Merge pull request #9313 from bkzl/return-false-on-toggle-on-error-pages

Return false in toggle function on error pages
clarify singular and plural routes

Found the wording on line 158 somewhat confusing. Added short example to clarify.
Gist URLs are now namespaced

see: https://github.com/blog/1406-namespaced-gists
Bump up minitest dependency and remove our own reinvented version of ParallelEach
Update guides/source/active_record_querying.md

Fix missing `ORDER BY id ASC` for Client.first(2);
Uppercase the little y in the SQL equivalent of the Client.last(2).
Document changes in #7968
Merge pull request #9317 from balexand/patch-1

Document changes from #7968 in Upgrading Guide
Add headings to rake routes table
Fix bug in code example from layouts and rendering guide

The code in 2.3.2 assumed that render has an alert option like
redirect_to to create a flash alert message, but it doesn't.
Merge pull request #9318 from steveklabnik/router_headings

Add headings to rake routes table
Add message when you have no routes defined.

Print a message in both `rake routes` and at GET "/rails/info/routes"
that lets you know you have no routes defined, as well as linking to the
Rails Guide on the topic.
Merge pull request #9316 from steveklabnik/no_routes

Print message on stderr when no routes are defined.
use strip_heredoc to keep indentation consistent.

Thanks @sikachu. :heart: