Revert "add active model basics wip to guides/documents.yaml"

Reason: WIP guides are not in the index because they are partial
work pushed to the repo. Either there is someone working on them
or else the work was interrupted.

Guides are added to the index page when they are finished, the
author considers the draft to be complete, someone reviews them,
and overall they are considered to be good for users to read.

This reverts commit eefc03a8069bddfe31751c4bd4fb1804e7f33c2c.
Minor doc fix of ActiveModel::Naming.

- qoute example line's result when it kind of String
- right ("singular_route_key") method in example
Update testing.rake with more accurate description of test task.

According to #5ecd12 change.

[ci skip]
Merge pull request #12688 from simi/patch-1

Update testing.rake with more accurate description of test task.
Clarify that visiting http://localhost:3000 should be done in a browser.
Merge pull request #12690 from durrantm/minor_README_change

Clarify that visiting http://localhost:3000 should be done in a browser. [ci skip]
Convert CDATA input to string before gsub'ing

Rails 3.2 API allowed arbitrary input for cdata_section;
this change re-introduces the old behaviour.
Merge pull request #12693 from carpodaster/convert-cdata-input-to-string

Convert CDATA input to string before gsub'ing
add the fetch method to sessions
Merge pull request #12692 from dmathieu/session_fetch

Add session#fetch
short arrays in inspect
Merge pull request #12653 from releu/short_arrays_in_inspect

Short arrays in record.inspect
Update pull request instructions as per the new Github UI

[ci skip]
Merge pull request #12687 from notalex/master

Update pull request instructions as per the new Github UI [ci skip]
session#fetch doesn't behave exactly like Hash#fetch.

Mention it in the changelog and add a test checking for regressions.

Hash#fetch isn't adding the defaultly returned value.
However, in the session, saving it is the behavior we should expect.

See discussion in #12692
Merge pull request #12702 from dmathieu/finetune_session_fetch

session#fetch doesn't behave exactly like Hash#fetch.
Hstore and JSON fields are not supported with store

The use of `store` on Hstore fields (for instance) is not needed
because serialization aimed to interact with Ruby objects and not
with provided field types
fix code typo in `MysqlAdapter` .Closes #12647.
no need for a CHANGELOG entry. [ci skip].
use a thread local rather than a queue so events are in the right order