placessidebar: fix documentation
placessidebar: fix documentation

Use the same explanation of why GtkPlacesSidebar::show-connect-server
was deprecated and its replacements on getter and setter.

Also, fix a mistakenly deprecated function.

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