Cleanup ul_encoded_params_parsing_test
 #11288: Removed duplicated touching

if belongs to model with touch option on touch

Closes #11288
Merged sections to reflect current contents of guide.

Section "allowing the update of fields" was now just a general
introduction to the idea of the model (actual updating was two sections
later).  So, merged into the section about validation.
Merge pull request #11322 from blahedo/master

Tidying "getting started" guide
Make HashWithIndifferentAccess#select always return the hash.

Hash#select! returns nil if the hash didn't change and thus behaves differently
from select, so it's return value can't be used as result for the latter.
Merge pull request #11327 from schuetzm/hash-with-indifferent-access-select

Make HashWithIndifferentAccess#select always return the hash.
Extract common query to a constant.

Perf ref: https://gist.github.com/vipulnsward/8209749201dfdd678c97
Merge pull request #11329 from vipulnsward/cache_one

Extract common query to a constant.
Remove action view test duplication

Same test exists above 2 or 3 lines.
Merge pull request #11332 from sanemat/fix/av-test-duplication

Remove actionview test duplication
fixes broken links in the API [Fixes #11335] [ci skip]
Merge pull request #11306 from jetthoughts/11288_remove_extra_queries_for_belongs_to_with_touch

 #11288: Removed duplicated touching

Conflicts:
	activerecord/CHANGELOG.md
fixes Rails version for the stable API [ci skip]
RUNNING_UNIT_TESTS file is in rdoc [ci skip]
actionpack not having activerecord tests [ci skip]
Merge pull request #11337 from arunagw/actionview-rdoc

RUNNING_UNIT_TESTS tweaks.
Running isolated test for assertions and journey

in actionpack
Some performance benchmarking for take vs limit

Also added a dummy progress bar during insert of records so it shows something is happening.
Performance report
          Model.take     6198.9 (±13.4%) i/s -     121743 in  20.042671s
         Model.take!     6173.6 (±13.6%) i/s -     121242 in  20.057006s
Model.all limit(100)      107.8 (±15.8%) i/s -       2106 in  20.022316s
 Model.all take(100)      105.2 (±15.2%) i/s -       2061 in  20.062509s
Merge pull request #11339 from arunagw/running-actionpack-isolated

Running isolated test for assertions and journey
Cleaned up wording and tags.

Replaced <br /> with <br> for consistency; Added note about
singular/plural distinction (which was previously confusing to a Rails
noob); Rephrased explanation of how form is routed to controller, again
to reduce confusion; and added explanation to replace incorrect link.
[ci skip]