Hey @zoeblade, thank you on behalf of @mamedev_org for all of the typo fixes that you've been submitting lately! I've been wanting to go through and do such a cleanup for ages, and I'm ecstatic to have one less thing on my to-do list. 
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I'll carry on then, thank you!
If I can make a request on behalf of the devs though, please try to leave the grammar/spelling cleanups in files included by emu.h until last - touching a file that emu.h includes causes what amounts to a full rebuild of MAME, which takes upward of an hour and a half. :)
