Add note re deleting only the mutations

[hyanwong]

Fixes #1034

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.08%. Comparing base (9dcae00) to head (92b0964).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3066      +/-   ##
==========================================
- Coverage   89.86%   87.08%   -2.78%     
==========================================
  Files          29       11      -18     
  Lines       32150    24679    -7471     
  Branches     5768     4559    -1209     
==========================================
- Hits        28890    21491    -7399     
+ Misses       1859     1824      -35     
+ Partials     1401     1364      -37     

Flag	Coverage Δ
c-tests	86.71% <ø> (ø)
lwt-tests	80.78% <ø> (ø)
python-c-tests	89.05% <ø> (ø)
python-tests	?

Flags with carried forward coverage won't be shown. Click here to find out more.

see 18 files with indirect coverage changes