[Bug 771382] dvbsuboverlay: map with READWRITE for overlay blend

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771382

--- Comment #3 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 335493
  --> https://bugzilla.gnome.org/attachment.cgi?id=335493&action=edit
videooverlaycomposition: document required map flags

Fix documentation for gst_video_overlay_composition_blend(). The video frame
needs to be mapped with GST_MAP_READWRITE flag.

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