The changes were made with the following shell command:
for formula in $(grep -l 'desc "[Aa]n\?\s' Library/Formula/*.rb); do
echo $formula
vim -c '/desc "/s/[Aa]n\? //|normal f"gU2lZZ' $formula
done
ClosesHomebrew/homebrew#42333.
Signed-off-by: Xu Cheng <xucheng@me.com>