Document fake mute control for Squeezelite devices (#408)

Added information about 'fake mute' control option for Squeezelite devices.

Author: OzGav

docs/player-support/squeezelite.md

@@ -26,3 +26,4 @@ In addition to the [Individual Player Settings](../settings/individual-player.md
 - Running LMS on the same server as MA with the MA Squeezelite provider enabled can have undesired effects
 - Make sure that you do not have the "slimproto" (Squeezebox players) integration running in Home Assistant
 - Ordinarily do not use queue flow mode unless using older Squeezebox hardware player that has issues transitioning. Enabling queue flow mode may solve playback issues, however, it might come with the side effect of disabling actual physical buttons and/or display of metadata on the device itself
+- Squeezelite devices have no native mute functionality. If desired the "fake mute" control option can be used and this is found in the `Player Controls` section for each individual player