[Chapel Merge] Update atomics docs operators

Branch: refs/heads/main
Revision: 76bbdcc
Author: mppf
Link: Update atomics docs operators by mppf · Pull Request #20633 · chapel-lang/chapel · GitHub
Log Message:

Merge pull request #20633 from mppf/update-atomics-docs-operators

Update atomics docs operators

Updated the text describing atomics to include cast and assignment and
then no-doc these operators. I chose this strategy because it seemed that
these operators should be documented in a consistent manner with init=
which is no-doc'd and described in the text.

Reviewed by @ronawho - thanks!

Modified Files:
M modules/internal/Atomics.chpl

Compare: https://github.com/chapel-lang/chapel/compare/d59fc6d348d5...76bbdcc00f93