[Meta] Fix incorrect Implements hook_*_* docblock in core

Problem/Motivation

This is a meta issue after identifying a problem in issue #2613146: filter_test_filter_format_insert() has the wrong "implements" documentation → with docblock of different hooks implemented in core and docblock is provided as:

/**
 * Implements hook_*_*().
 */

See:
https://www.drupal.org/project/drupal/issues/2613146#comment-10555240 →
https://www.drupal.org/project/drupal/issues/2613146#comment-10555332 →

Proposed resolution

1. Create one issue per module to fix issue with docblock Implements hook_*_*
2. Issue with individual core module/theme can be identified with the command below:
1. grep -rn 'Implements hook_.*_.*\(\).' core/modules/<module>
2. grep -rn 'Implements hook_.*_.*\(\).' core/themes/<theme>
3. The command above will give you output of each docblock which is in the format ofImplements hook_*_* . Verify that each docblock is correct and mentioning an existing hook.
4. If there is any docblock which is not mentioning a correct hook then create a new issue for that module as a child issue → of this module.

Remaining tasks

See Child issues section.

User interface changes

N/A

API changes

N/A

Data model changes

N/A