[Bug 701424] fix few typos in manual and pwg

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701424
  GStreamer | documentation | git

--- Comment #1 from Andrzej Bieniek <andyhelp at gmail.com> 2013-06-01 13:37:53 UTC ---
Created an attachment (id=245823)
 View: https://bugzilla.gnome.org/attachment.cgi?id=245823
 Review: https://bugzilla.gnome.org/review?bug=701424&attachment=245823

Single patch with multiple commits

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