add config helper functions to credential doc

[DyfanJones]

No description provided.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (17279e9) 83.65% compared to head (a9bbefb) 83.64%.

❗ Current head a9bbefb differs from pull request most recent head 81a1691. Consider uploading reports for the commit 81a1691 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
- Coverage   83.65%   83.64%   -0.01%     
==========================================
  Files         195      195              
  Lines       13213    13213              
==========================================
- Hits        11053    11052       -1     
- Misses       2160     2161       +1     

see 9 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.