Update faq.rst

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@ -128,10 +128,14 @@ How can I increase the maximum number of file descriptors?
One of the first settings that usually needs to be bumped is the maximum number
of open file descriptors for a given process. For the confused out there,
remember that Unices treat sockets as files.
.. warning::
Considering non-privileged users are not able to relax the limit, you should
firstly switch to root user, increase the limit, then run gunicorn. Using ``sudo
ulimit`` would not take effect.
Try systemd's service unit file, or an initscript which runs as root.
How can I increase the maximum socket backlog?
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