Add comment on the cleanup spam section

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+In the cleanup spam section:
+
+> Caveat: if there are no commits you want to keep (i.e. all the commits since the last merge into master are either spam or spam reverts) then git rebase will abort.
+
+Wouldn't it be enough then to use `git reset --hard` to the desired last good commit?
+
+regards,
+iustin