[Bug 737129] New: docs: Improve gst_buffer_get_meta to clear up confusion

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737129
  GStreamer | documentation | git

           Summary: docs: Improve gst_buffer_get_meta to clear up
                    confusion
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: documentation
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: gnome at williammanley.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=286825)
 View: https://bugzilla.gnome.org/attachment.cgi?id=286825
 Review: https://bugzilla.gnome.org/review?bug=737129&attachment=286825

Documentation patch

I was confused by the existence of `gst_buffer_get_meta` as it suggested
to me that you should only attach one of any type of GstMeta to a buffer.
Tim told me on IRC that it's perfectly fine to attach multiple from a
single API so I'm documenting that here.

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