places view: Documentation fixups
places view: Documentation fixups

Rewrite gtk_places_sidebar_set_show_enter_location docs, add
references to the relevant signals, remove mentions of
GtkPlacesView from the docs, since it is not public at this point.

https://bugzilla.gnome.org/show_bug.cgi?id=752633

davidgumberg/gtk,jadahl/gtk,grubersjoe/adwaita,grubersjoe/adwaita,davidgumberg/gtk,jigpu/gtk,jadahl/gtk,jigpu/gtk,alexlarsson/gtk,jadahl/gtk,Adamovskiy/gtk,Adamovskiy/gtk,grubersjoe/adwaita,grubersjoe/adwaita,chergert/gtk,alexlarsson/gtk,davidgumberg/gtk,Adamovskiy/gtk,chergert/gtk,alexlarsson/gtk,jigpu/gtk,chergert/gtk,alexlarsson/gtk,alexlarsson/gtk,chergert/gtk,davidgumberg/gtk,jadahl/gtk,grubersjoe/adwaita,grubersjoe/adwaita,jigpu/gtk,Adamovskiy/gtk,chergert/gtk,alexlarsson/gtk,Adamovskiy/gtk,chergert/gtk,jadahl/gtk,jigpu/gtk,Adamovskiy/gtk,chergert/gtk,Adamovskiy/gtk,grubersjoe/adwaita,davidgumberg/gtk,davidgumberg/gtk,jigpu/gtk,grubersjoe/adwaita,chergert/gtk,Adamovskiy/gtk,jadahl/gtk,alexlarsson/gtk,davidgumberg/gtk,jigpu/gtk,jadahl/gtk,jadahl/gtk,davidgumberg/gtk,alexlarsson/gtk,jigpu/gtk