Update command_ref.md

Added MMU_UNLOAD alias for MMU_EJECT

doc/command_ref.md

@@ -46,7 +46,7 @@ Firstly you can get a quick reminder of commands using the `MMU_HELP` command fr
   | `MMU_SELECT_BYPASS` | Select the bypass selector position if configured | None |
   | `MMU_CHANGE_TOOL` | Perform a tool swap (generally called from 'Tx' macros). Use `STANDALONE=1` option in your print_start macro to saftely load the initial tool | `TOOL=[0..n]` <br>`STANDALONE=[0\|1]` Optional to force standalone logic (tip forming)<br> `QUIET=[0\|1]` Optional to always suppress swap statistics |
   | `MMU_LOAD` | Loads filament in currently selected tool/gate to extruder. Optionally performs just the extruder load part of the sequence - designed for bypass loading or non MMU use | `EXTRUDER_ONLY=[0\|1]` To force just the extruder loading (automatic if bypass selected) |
-  | `MMU_EJECT` | Eject filament and park it in the MMU gate or does the extruder unloading part of the unload sequence if in bypass | `EXTRUDER_ONLY=[0\|1]` To force just the extruder unloading (automatic if bypass selected) |
+  | `MMU_EJECT` | `MMU_UNLOAD` | Eject filament and park it in the MMU gate or does the extruder unloading part of the unload sequence if in bypass | `EXTRUDER_ONLY=[0\|1]` To force just the extruder unloading (automatic if bypass selected) |
   | `MMU_PRELOAD` | Helper for filament loading. Feed filament into gate, MMU will catch it and correctly position at the specified gate | `GATE=[0..n]` The specific gate to preload. If omitted the currently selected gate can be loaded |
   | `MMU_PAUSE` | Pause the current print and lock the MMU operations. (`MMU_UNLOCK + RESUME` or just `RESUME` to continue print) | `FORCE_IN_PRINT=[0\|1]` This option forces the handling of pause as if it occurred in print and is useful for testing. Calls `PAUSE` by default or your `pause_macro` if set |
   | `MMU_RECOVER` | Recover filament position and optionally reset MMU state. Useful to call prior to RESUME if you intervene/manipulate filament by hand | `TOOL=[0..n]\|-2` Optionally force set the currently selected tool (-2 = bypass). Use caution! <br>`GATE=[0..n]` Optionally force set the currently selected gate if TTG mapping is being leveraged otherwise it will get the gate associated with current tool. Use caution! <br>`LOADED=[0\|1]` Optionally specify if the filamanet is fully loaded or fully unloaded. Use caution! If not specified, MMU will try to discover filament position <br>`STRICT=[0\|1]` If automatically detecting impose stricter testing for filament position (temporarily sets 'strict_filament_recovery' parameter) |