gnome,kde: Correct links.

Author: flexibeast

src/config/graphical-session/gnome.md

@@ -20,7 +20,7 @@ GDM defaults to providing a Wayland session via the `mutter` window manager, but
 an X session can be chosen instead.
 
 If you wish to start an X-based GNOME session from the console, use
-[startx](./xorg.html#startx) to run `gnome-session`.
+[startx](./xorg.md#startx) to run `gnome-session`.
 
 GNOME applications can be installed via the `gnome-apps` package.
 

src/config/graphical-session/kde.md

@@ -15,5 +15,5 @@ X-based Plasma session, but you can request a Wayland-based Plasma session
 instead.
 
 If you wish to start an X-based session from the console, use
-[startx](./xorg.html#startx) to run `startplasma-x11`. For a Wayland-based
+[startx](./xorg.md#startx) to run `startplasma-x11`. For a Wayland-based
 session, run `startplasma-wayland` directly.