Links to gstreamermm code snippets in GStreamer documentation

Submitted by Marcin Kolny @loganek

Link to original bug (#770520)

Description

Hi,
At the beginning I'd like to emphasize, that it's just my idea I'd like to discuss with GStreamer core developers, not a GStreamer bug.
However, bugzilla IMO seems to be better place to discuss it than mailing list.
And to really get to the point, I was thinking if we could add links in GStreamer manual to gstreamermm examples with corresponding code snippets.
E.g. there are two sample code blocks on the page: https://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-elements-create.html ; I could create gstreamermm examples for both, and we could add links to C++ version.

If you think it's bad idea, and it'll only make documentation chaotic, it's fine - this is just an idea :)

However, I think it might have a few advantages:

1. people will know about c++ interface.
2. it would be easier to learn gstreamermm, since we don't have separated guideline for the wrapper.