Fixed grammar [ci skip]

Fix Guide HTML validation

Fix rails dbconsole for jdbcmysql adapter

refactor and clean up delete_all method

Now that delete_all with destroy or delete_all dependency behave
the same we no longer need this conditional. This means we can remove
the new delete_all_with_dependency method I added and go straight
to delete_records from delete_all, passing :all and the dependent
directly.

[ci skip]

Add support for module-level table_suffix in models

This makes table_name_suffix work the same as table_name_prefix when
using namespaced models. Pretty much the same as 67d1cec4.

[Regression 4.0 -> 4.1] Put back Relation#join method as a delegate to Array

This is a regression 4.0 -> 4.1 fix.
In 4.1.0 Relation#join is delegated to Arel#SelectManager.
In 4.0 series it is delegated to Array#join

This patch puts back the behaviour of 4.0

There are too many "action name" variables around the process method.

Callable route constraint verification

Conflicts:
	actionpack/CHANGELOG.md

[Fixes #14948] Hash#to_query: right serialization for  empty hash and array

The case where the value is present is more common

Fix exception when logging SQL w/ nil binary value.

Conflicts:
	activerecord/CHANGELOG.md

Convert column name to string only once

Remove deprecated file

Follow-up to #14905 and formatting pass [ci skip]

on the Getting Started guide.

[skip ci]

Added 2 changes suggested by @robin850 [skip ci]

column_for will raise in case column is not found for the given table,
so there is no need to handle that here.