[PR #584/0dbedf57 backport][stable-2] Document MySQL and MariaDB don't store roles with same manner

[patchback]

This is a backport of PR #584 as merged into main (0dbedf5).

SUMMARY

To prevent confusion like in #579, I propose to add this code comment.

ISSUE TYPE

• Docs Pull Request

COMPONENT NAME

module_util: user

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (89d1637) 76.48% compared to head (10de776) 76.14%.
Report is 2 commits behind head on stable-2.

Additional details and impacted files

@@             Coverage Diff              @@
##           stable-2     #585      +/-   ##
============================================
- Coverage     76.48%   76.14%   -0.35%     
============================================
  Files            28       27       -1     
  Lines          2326     2322       -4     
  Branches        545      562      +17     
============================================
- Hits           1779     1768      -11     
- Misses          382      384       +2     
- Partials        165      170       +5     

Flag	Coverage Δ
integration	73.06% <ø> (ø)
sanity	?
units	34.92% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
plugins/module_utils/user.py	84.73% <ø> (ø)

... and 7 files with indirect coverage changes

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[laurent-indermuehle]

I pushed a new commit to make GitHub Action realized that the target branch has been updated. It launched 2 sets of tests, one for the push, the other for the merge request.
The first is unaware of the change in the target branch, the second is.
I have no hope to understand how GitHub Actions works -_-'

This is only a comment, I will merge and forget about it ;)