Some general grammar and style fixes in the book
Merge remote-tracking branch 'upstream/2.3' into general-grammar-and-style-fixes

Conflicts:
	book/forms.rst
Fixes incorrect latin abbrev
Some more fixes after proofreading
add validation config reference section
Completed the needed context to successfully test commands
bug #4582 Completed the needed context to successfully test commands with Helpers (peterrehm)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #4582).

Discussion
----------

Completed the needed context to successfully test commands with Helpers

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #4581

As mentioned in symfony/symfony#12798 the explanation about the initialization is not clear.
Therefore I have added the needed context and a reference to the related cookbook article.

Commits
-------

a94bd71 Completed the needed context to successfully test commands
use a global Composer installation
Fix typo: than in Twig => than Twig templates

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets | #4696
minor #4679 General grammar and style fixes in the book (frne)

This PR was merged into the 2.3 branch.

Discussion
----------

General grammar and style fixes in the book

Contains numerous grammar, style and readability fixes (see diff)

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | >= 2.3
| Fixed tickets |

Commits
-------

86d7a6d Some more fixes after proofreading
5c754e0 Fixes incorrect latin abbrev
7e4904f Merge remote-tracking branch 'upstream/2.3' into general-grammar-and-style-fixes
1da061c Some general grammar and style fixes in the book
minor #4706 Fix typo: than in Twig => than Twig templates (ifdattic)

This PR was merged into the 2.3 branch.

Discussion
----------

Fix typo: than in Twig => than Twig templates

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3
| Fixed tickets | #4696

Commits
-------

a8ec695 Fix typo: than in Twig => than Twig templates
feature #4173 use a global Composer installation (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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use a global Composer installation

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #4170

This pull request replaces all mentions of local Composer installations, but uses a gobal Composer installation instead.

**Note:** This should be considered on hold and not be merged until we have an agreement on this in #4170.

Commits
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9ab1c56 use a global Composer installation
feature #4673 [Reference] add validation config reference section (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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[Reference] add validation config reference section

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Commits
-------

79ad3b5 add validation config reference section
Merge branch '2.3' into 2.5

* 2.3:
  Fix typo: than in Twig => than Twig templates
  use a global Composer installation
  Completed the needed context to successfully test commands
  add validation config reference section
  Some more fixes after proofreading
  Fixes incorrect latin abbrev
  Some general grammar and style fixes in the book