cross link hardware_sound_player and hardware_sound_system pages

Author: bosh

docs/code/api_reference/config_players/hardware_sound_player.md

@@ -1,9 +1,5 @@
 # hardware_sound_player API Reference
 
-Config Reference:
-
-* [hardware_sound_player:](../../../config/hardware_sound_player.md)
-
 `self.machine.hardware_sound_player`
 
 ``` python
@@ -33,3 +29,8 @@ Parse string config.
 `play(settings, context, calling_context, priority=0, **kwargs)`
 
 Play sound on external card.
+
+## Related Pages:
+
+* [hardware_sound_player: Config Reference](../../../config/hardware_sound_player.md)
+* [Hardware sound player Config Player Reference](../../../config_players/hardware_sound_player.md)

docs/code/api_reference/devices/hardware_sound_systems.md

@@ -1,9 +1,5 @@
 # hardware_sound_systems API Reference
 
-Config Reference:
-
-* [hardware_sound_systems:](../../../config/hardware_sound_systems.md)
-
 `self.machine.hardware_sound_systems.*`
 
 ``` python
@@ -57,3 +53,7 @@ Stop all sounds on track.
 `text_to_speech(text: str, platform_options, track: int = 1)`
 
 Text to speech output.
+
+## Related Pages:
+
+* [hardware_sound_systems: Config Reference](../../../config/hardware_sound_systems.md)

docs/config/hardware_sound_player.md

@@ -79,7 +79,9 @@ Single value, type: `string`. Defaults to empty.
 
 The number of your sound.
 
-## Related How To guides
+## Related Pages:
 
 * [Arduino Pinball Controller](../hardware/apc/index.md)
 * [How to use MPF with the LISY platform](../hardware/lisy/index.md)
+* [Hardware sound player Config Player Reference](../config_players/hardware_sound_player.md)
+* [hardware_sound_player API Reference](../code/api_reference/config_players/hardware_sound_player.md)

docs/config/hardware_sound_systems.md

@@ -71,3 +71,4 @@ Not used.
 
 * [Arduino Pinball Controller](../hardware/apc/index.md)
 * [How to use MPF with the LISY platform](../hardware/lisy/index.md)
+* [hardware_sound_systems API Reference](../code/api_reference/devices/hardware_sound_systems.md)

docs/config_players/hardware_sound_player.md

@@ -4,7 +4,6 @@ title: Hardware Sound player
 
 # Hardware Sound player
 
-
 The *hardware sound player* is a
 [config player](index.md)
 that's used to control sounds. (This player is part of the MPF media
@@ -27,3 +26,8 @@ a step.
 
 Additional information may be found in the
 [hardware_sound_player](../config/hardware_sound_player.md) configuration reference documentation.
+
+## Related Pages:
+
+* [hardware_sound_player: Config Reference](../config/hardware_sound_player.md)
+* [hardware_sound_player API Reference](../code/api_reference/config_players/hardware_sound_player.md)