Fix validation error type `SA04` and check in CI

[MarckK]

Problem description

In order to have a continuous check by the CI on validation error SA04 (Missing description for See Also reference), fixing them in the code base enables the addition to the CI for automated testing in the future.

Please see overview of the errors.

Todo:

• get rid of the errors in the code base
• update the code_check.sh script to take into account the SA04 type of errors

[Sedosa]

Hi! May I work on this?

[MarckK]

Yes, please do @Sedosa :)

[dataxerik]

take