No functional changes.
For all the recently moved keyframing code I did the following:
* Remove comments that just repeat what the code is doing.
* Move comments for public functions to their location in the header file.
* Make sure comments are formatted properly with a capital letter at the start and a dot at the end.
Pull Request: https://projects.blender.org/blender/blender/pulls/114448
cfb50a2e2e