Annotate remainder of ping.lua

[lL1l1]

Description of the proposed changes

Annotates the remaining files following the work in #6798.

Testing done on the proposed changes

There are only remaining annotation warnings related to return types of GetFrame() and LOC().

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in a changelog snippet according to the guidelines.
• Request 2-3 reviewers from the list of reviewers and their areas of knowledge.