fix[docs]: specify units and defaults for ws_* args in docs

[ryan-mccaffrey]

Summary

Small updates for adding time units and default values for the ws-ping-interval and ws-ping-timeout in documentation

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[Kludex]

👍

[Kludex]

Thanks.