[Bug 795610] Misc. typo fixes in source comments and doxygen

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795610

--- Comment #1 from Kunda <chitty_cloud at me.com> ---
Please also inspect the 2nd patch which contains some source typo fixes and a
trivial typo fix I wasn't certain about.

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