Make it clear that "context-manager" prop is internal.
Make it clear that "context-manager" prop is internal.

GNOME/gupnp,lovebug356/gupnp,ZachGoldberg/gupnp-gi,GNOME/gupnp,ZachGoldberg/gupnp-gi,ZachGoldberg/gupnp-gi,GNOME/gupnp,lovebug356/gupnp,GNOME/gupnp