[Bug 766459] ges: ges_asset_set_proxy documentation fix and add some g-i annotations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766459

--- Comment #2 from Aurélien Zanelli <aurelien.zanelli at parrot.com> ---
Created attachment 327903
  --> https://bugzilla.gnome.org/attachment.cgi?id=327903&action=edit
[2/2] ges: add some g-i annotations according to documentation

Annotation was mainly added according to documentation.

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