Document zoom_fov in settingtypes.txt and minetest.conf.example

builtin/settingtypes.txt

@@ -435,6 +435,10 @@ vsync (V-Sync) bool false
 #    Field of view in degrees.
 fov (Field of view) int 72 30 160
 
+#    Field of view while zooming in degrees.
+#    This requires the "zoom" privilege on the server.
+zoom_fov (Field of view for zoom) int 15 15 160
+
 #    Adjust the gamma encoding for the light tables. Lower numbers are brighter.
 #    This setting is for the client only and is ignored by the server.
 display_gamma (Gamma) float 1.8 1.0 3.0

minetest.conf.example

@@ -496,6 +496,11 @@
 #    type: int min: 30 max: 160
 # fov = 72
 
+#    Field of view while zooming in degrees.
+#    This requires the "zoom" privilege on the server.
+#    type: int min: 15 max: 160
+# zoom_fov = 15
+
 #    Adjust the gamma encoding for the light tables. Lower numbers are brighter.
 #    This setting is for the client only and is ignored by the server.
 #    type: float min: 1 max: 3