…cation (javiereguiluz, HeahDude)

This PR was merged into the 2.7 branch.

Discussion
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Merged and improved the articles about testing + authentication

This fixes #6741.

Commits
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fc8e8c6 Fixed status code test
be5fe37 Improved a test
211da90 Merged and improved the articles about testing + authentication

* 2.7:
  [#7507] fix component name
  [#7490] minor typo fix
  Added a note about redirections to absolute URLs in tests
  Added the changes suggested by reviewers
  Fixed status code test
  Improved a test
  Merged and improved the articles about testing + authentication
  Reworded the section about form overridding
  Update installation.rst
  Update prepend_extension.rst
  Update override.rst
  Update installation.rst
  Update inheritance.rst
  Unify placeholders in documentation and code

* 2.8: (46 commits)
  [#7507] fix component name
  [#7490] minor typo fix
  Added a note about redirections to absolute URLs in tests
  Added the changes suggested by reviewers
  [#7620] use generate() in PHP templates before 2.8
  Fixed the RST syntax
  Improve example context
  [#5621] Enhancing example of using bundle config
  [#7601] minor tweak
  Update expiration.rst
  Update expiration.rst
  Update expiration.rst
  Update expiration.rst
  Minor reword and fixed the line length
  Improve specification explanation
  [#7664] minor wording tweak
  Rewords and minor fixes
  Add an explanation about «constraints» validation
  [#7645] enumerate ordered list items implicitly
  Adding a new article about "Creating a Bug Reproducer"
  ...

* 2.7:
  Made unmapped field example in forms chapter more descriptive
  [#7507] fix namespace

* 2.8:
  Rewriting the service container docs
  Minor reword
  Adding a tip for validation in forms without class
  Added a note about the .htaccess files included by Symfony apps
  Made unmapped field example in forms chapter more descriptive
  [#7507] fix namespace
  Explain better how to enable the ClockMock annotation

* 3.2: (71 commits)
  Rewriting the service container docs
  Minor reword
  Adding a tip for validation in forms without class
  [#7217] add versionadded directives
  [#7203] merge note and versionadded directive
  Use the new configurator YAML syntax
  Added a note about the .htaccess files included by Symfony apps
  Made unmapped field example in forms chapter more descriptive
  [#7507] fix namespace
  [#7507] fix component name
  [#7490] minor typo fix
  Added a note about redirections to absolute URLs in tests
  [#7204] link to API doc
  Added docs for JsonResponse::fromJsonString
  Added the changes suggested by reviewers
  [#7620] use generate() in PHP templates before 2.8
  Fixed the RST syntax
  Improve example context
  Minor formatting changes
  [#7519] some minor tweaks
  ...