Document the database for `Input.get_joy_name()` and `Input.get_joy_guid()`

(cherry picked from commit 922d2b7034fb1655f489fce502a3eb5eadf801f2)

doc/classes/Input.xml

@@ -145,14 +145,14 @@
 			<return type="String" />
 			<argument index="0" name="device" type="int" />
 			<description>
-				Returns a SDL2-compatible device GUID on platforms that use gamepad remapping. Returns [code]"Default Gamepad"[/code] otherwise.
+				Returns a SDL2-compatible device GUID on platforms that use gamepad remapping, e.g. [code]030000004c050000c405000000010000[/code]. Returns [code]"Default Gamepad"[/code] otherwise. Godot uses the [url=https://github.com/gabomdq/SDL_GameControllerDB]SDL2 game controller database[/url] to determine gamepad names and mappings based on this GUID.
 			</description>
 		</method>
 		<method name="get_joy_name">
 			<return type="String" />
 			<argument index="0" name="device" type="int" />
 			<description>
-				Returns the name of the joypad at the specified device index.
+				Returns the name of the joypad at the specified device index, e.g. [code]PS4 Controller[/code]. Godot uses the [url=https://github.com/gabomdq/SDL_GameControllerDB]SDL2 game controller database[/url] to determine gamepad names.
 			</description>
 		</method>
 		<method name="get_joy_vibration_duration">