[Patch] GettingStarted.rst update

[Erik de Castro Lopo]

Sean Silva wrote:

> Perhaps for consistency use a "z" in "sanitizers" since that is what seems
> to be used everywhere else in the docs, but it's not a big deal.

Sorry thats British (and Australian) vs American spelling. I'm happy
to have whoever commits this fix that or I can re-roll and re-submit
the patches.

Cheers,
Eri
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Erik de Castro Lopo
http://www.mega-nerd.com/