[chore][docs/rfc] Add text regarding conversations

[mx-psi]

Description

Based on the experience of this process going through once, I am suggesting we make the following changes:

1. Require announcing the final comment period via a comment and on the #otel-collector-dev channel.
2. Require that all conversations are resolved. Allow RFC author to resolve any conversation, but require them to leave a comment explaining why

Link to tracking issue

Fixes #11737

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.61%. Comparing base (f74890a) to head (4526b78).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11738   +/-   ##
=======================================
  Coverage   91.61%   91.61%           
=======================================
  Files         443      443           
  Lines       23770    23770           
=======================================
  Hits        21776    21776           
  Misses       1620     1620           
  Partials      374      374           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mx-psi]

Given the approvals, this is entering the final comment period. Since we have Thanksgiving I am going to exclude Thursday and Friday and merge on or after 2024-12-04