## Summary

Location of documentation issue: (e.g. the Haddocks of `base`, the GHC user's guide)

Write a brief description of the issue.


## Proposed improvements or changes

Feel free to propose changes, either concrete or abstract.


## Environment

* GHC version used (if appropriate): 



/label ~bug
/label ~documentation
/label ~"needs triage"


Add issue template for documentation issues
gitlab: Add issue template for documentation issues

Fixes #17180.
