[cairo] Fixes for "it's" typos in comments

[Daniel Holbert]

Hi cairo folks,

As a fun itch to scratch, I've been fixing incorrect uses of the 
contraction "it's" in comments within the mozilla source tree (tracked 
in https://bugzilla.mozilla.org/show_bug.cgi?id=458167 ), and I ran 
across 6 instances of this typo in mozilla's snapshot of cairo.

The attached patch fixes these typos in cairo -- per Vlad's suggestion, 
I'm sending this patch upstream to you guys, in the hopes that you'll 
incorporate it in future releases. :)

The patch is available on the bug page as well, if you'd like to examine 
it in Bugzilla's shiny patch-viewer:
    https://bugzilla.mozilla.org/attachment.cgi?id=358196&action=diff

Thanks!
Daniel Holbert
Mozilla Corporation
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