Fix GlobalScope doc link for NavigationServer3D

Fixes GlobalScope doc link for NavigationServer3D.

doc/classes/@GlobalScope.xml

@@ -1509,7 +1509,7 @@
 			The [NavigationServer2D] singleton.
 		</member>
 		<member name="NavigationServer3D" type="NavigationServer3D" setter="" getter="">
-			The [NavigationServer2D] singleton.
+			The [NavigationServer3D] singleton.
 		</member>
 		<member name="OS" type="OS" setter="" getter="">
 			The [OS] singleton.