[Components][Security] Fix #3708
bug #3709 [Components][Security] Fix #3708 (bicpi)

This PR was merged into the 2.3 branch.

Discussion
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[Components][Security] Fix #3708

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #3708

Commits
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da025b1 [Components][Security] Fix #3708
was added -> was introduced
Fixed syntax
minor #3713 Updated versionadded directives to use "introduced" (WouterJ)

This PR was merged into the 2.3 branch.

Discussion
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Updated versionadded directives to use "introduced"

I was tired of explaining why we didn't update them on every created PR,
so I decided to just update them :P

| Q   | A
| --- | ---
| Doc fix? | yes
| New docs? | no
| Applies to | 2.3+
| Fixed tickets | many :)

Commits
-------

2884f18 Fixed syntax
c192278 was added -> was introduced
Merge branch '2.3' into 2.4

Conflicts:
	book/templating.rst
	components/class_loader/cache_class_loader.rst
	components/class_loader/class_loader.rst
	components/class_loader/debug_class_loader.rst
	components/event_dispatcher/immutable_dispatcher.rst
	components/process.rst
	reference/constraints/Regex.rst
	reference/constraints/UniqueEntity.rst
	reference/twig_reference.rst