improve the serialization of custom user models
changed create-project example

with the current version of composer you can use wildcards like "2.3.*" :-)
changed version in create project example to 2.4.* and remove the hint above as it is not longer necessary due to the new wildcard feature in composer
Remove invalid tip for multiple providers

As confirmed by stof in #9734, the tip has never worked and is not going to work
[Cookbook][Dynamic Forms] Simplify first example
[Cookbook][Form - direct submit] Fixed broken links to API
Merge pull request #3284 from franmomu/patch-1

[Cookbook][Form - direct submit] Fixed broken links to API
typos, CS and PSR links fixed
[Book][Validation] validate method in Validator returns ContraintViolationList object not an array
applies WouterJ suggestion
Merge pull request #3313 from zczapran/2.2

[Book][Validation] validate method in Validator returns ConstraintViolationList not an array
Update entity.rst

Note was added to clarify expectations of this option
Update entity.rst
[Components] [ExpressionLanguage] Fix missing quote
Added missing argument to the evaluator function
[Security][Acl] Documentation for the new updateUserSecurityIdentity method in Dbal\MutableAclProvider
fix first person's view style
[security] adding a tip about supported algorithm for 'hash' function
use a phpfunction link + vocabulary change (method -> function)
Change wording of voters