Draft: add note on changing General squad size based on priority

Why is this change being made?

This change provides a method for adjusting the number of folks in the General squad depending on priority. We will need to do this occasionally when the number of items requiring work for the General Squad exceeds the current capacity.

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added.
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)