This adds a link to https://useplaintext.email to email-clients.rst,
which is a more exhaustive resource on configuring various mail clients
for plain text use. submitting-patches.rst is also updated to direct
readers to email-clients.rst to equip new contributors with the
requisite knowledge to become a good participant on the mailing lists.
Signed-off-by: NDrew DeVault <sir@cmpwn.com>
Reviewed-by: NRandy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20200903160545.83185-3-sir@cmpwn.comSigned-off-by: NJonathan Corbet <corbet@lwn.net>