[Bug 763213] Add documentation about _NAME macros vs. _get_name functions

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763213

--- Comment #1 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Created attachment 323245
  --> https://bugzilla.gnome.org/attachment.cgi?id=323245&action=edit
element: flesh out macro accessor docs a bit

Just added some docs as well :)

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