This PR was submitted for the 3.3 branch but it was merged into the 2.7 branch instead (closes #8322).

Discussion
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fix #8321 minor changes in Serializer Component

Commits
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02b7732 fix #8321 minor changes in Serializer Component

* 2.7:
  Update events.rst
  First parameter to uniqid must be a string
  fix #8321 minor changes in Serializer Component
  Update filesystem.rst
  Update create_custom_field_type.rst
  Use "impersonator user" instead of "impersonating user"
  Update dynamic_form_modification.rst
  Update data_transformers.rst

* 2.8: (25 commits)
  [#8231] fix reStructuredText syntax
  Specified import order of config files
  [#7981] revert some changes
  Update upload_file.rst
  Added a missing redirection
  Update validation_group_service_resolver.rst
  Update redirection_map
  Update button_based_validation.rst
  Delete group_service_resolver.rst
  Create validation_group_service_resolver.rst
  [#8290] fix minor typo
  Update the setfacl description.
  Update events.rst
  Fixed a minor syntax issue
  Update phpunit_bridge.rst
  First parameter to uniqid must be a string
  fix #8321 minor changes in Serializer Component
  Update filesystem.rst
  Update associations.rst
  Update proxy_examples.rst
  ...