Comment updates to LearningTaskController.

I somehow failed to upload my last PS for:
https://chromium-review.googlesource.com/c/chromium/src/+/1497121

which contained comment changes based on CL feedback.  This
CL has those changes.

might have happened.  :)

Update: sicne this patch also failed to upload, I think I know what
Change-Id: I7a9475d9781ba5effa4138a7df0fd6b1adfaf89b
TBR: sandersd@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1512153
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639080}
1 file changed