docs/zh_CN: update the translation of process/email-clients.rst

Update to commit 91031ca3 ("docs: improve comment consistency in
.muttrc example configuration")

scripts/checktransupdate.py reports:

Documentation/translations/zh_CN/process/email-clients.rst
commit 91031ca3 ("docs: improve comment consistency in .muttrc
example configuration")
commit 7fe7de7b ("Docs/process/email-clients: Document HacKerMaiL")
commit 9c03bc90 ("Documentation: process: Revert "Document suitability
of Proton Mail for kernel development"")
commit 1d2ed923 ("Documentation: process: Document suitability of
Proton Mail for kernel development")
4 commits needs resolving in total

Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20241018014908.3783976-1-dzm91@hust.edu.cn