[skip-ci][nfc] fix doxy docu of 2D dist

[ferdymercury]

This Pull request:

Changes or fixes:

Checklist:

• tested changes locally
• updated the docs (if necessary)

[hageboeck]

Hello @ferdymercury,
to me, the change seems incorrect. The documentation where the change was applied is for a pdf in x, not in x, y.

[ferdymercury]

Hello @ferdymercury, to me, the change seems incorrect. The documentation where the change was applied is for a pdf in x, not in x, y.

Thanks for the review. I'm sorry for the oversight, I looked below instead of above. Fixed now.
(Please squash if accepted).

[hageboeck]

Thanks for the review. I'm sorry for the oversight, I looked below instead of above. Fixed now. (Please squash if accepted).

Of course, that makes a lot of sense!