Update RELEASING.md

[ericnordelo]

Add an entry for the doc branch creation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.57%. Comparing base (8404eb9) to head (1e15ff1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1195   +/-   ##
=======================================
  Coverage   91.57%   91.57%           
=======================================
  Files          47       47           
  Lines        1223     1223           
=======================================
  Hits         1120     1120           
  Misses        103      103           

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8404eb9...1e15ff1. Read the comment docs.