[Bug 738612] several typos in Plugin Writer's Guide

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=738612
  GStreamer | gstreamer (core) | git

--- Comment #1 from Felix Schwarz <felix.schwarz at oss.schwarz.eu> 2014-10-16 09:03:36 UTC ---
Created an attachment (id=288654)
 View: https://bugzilla.gnome.org/attachment.cgi?id=288654
 Review: https://bugzilla.gnome.org/review?bug=738612&attachment=288654

some trivial typos

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