[Slackdocs] Slackbook / Minor typo

[Xavier Belanger / Ellendhel]

Hi,

When translating the Slackbook section about the kernel (#19)
I have noticed a minor typo, but I don't have write permission
on the original page to fix it:

 "Sometimes a kernel patch my be available"

--> "Sometimes a kernel patch may be available" (missing 'a').

Thanks to anyone able to fix this! :-)

Sincerely.
-- 
Ellendhel <slackdocs at ellendhel.net>