[Bug 791646] Use gtk_doc=false to disable gtk-doc for meson builds

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791646

--- Comment #1 from Abhinav Singh <theawless at gmail.com> ---
Created attachment 365574
  --> https://bugzilla.gnome.org/attachment.cgi?id=365574&action=edit
meson: Use gtk_doc=false to disable gtk-doc

GNOME is standardizing on gtk_doc=false, hence replace disable_gtkdoc
with gtk_doc.

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