correct unit in server memory recommendations

[MrRinkana]

ps -o rss reports values in kikibytes, not kilobytes: https://man7.org/linux/man-pages/man1/ps.1.html

The command iself then uses 1024 to convert to MiB

As the section is about memory estimations, accuracy is important

Changes MB to MiB in two locations: the command output and text showing common nextcould fpm memory use

[tflidd]

on debian trixie they say that they use kilobytes....

       rss         RSS       resident set size, the non-swapped physical memory
                             that  a  task  has  used  (in  kilobytes).  (alias
                             rssize, rsz).

[MrRinkana]

@tflidd
That is an documentation issue in procps which was fixed in more recent versions; it has always actually been kikibytes.

https://gitlab.com/procps-ng/procps/-/merge_requests/211

Also the division done in the command here is by 1024 which means it cannot be MB (and if PS had been returning KB the resulting value was nonsensical: neither MB or MiB)