Introduce synonyms: 'move to workspace' and 'move container to workspace' and 'move window to workspace'

This makes the new 'move workspace to output' command much more clear

docs/userguide

@@ -1055,9 +1055,9 @@ specific workspace and immediately switch to that workspace, you can configure
 the following keybinding:
 
 *Example*:
--------------------------------------------
-bindsym mod+x move workspace 3; workspace 3
--------------------------------------------
+--------------------------------------------------------
+bindsym mod+x move container to workspace 3; workspace 3
+--------------------------------------------------------
 
 [[command_criteria]]
 
@@ -1241,15 +1241,15 @@ bindsym mod+j move left 20 px
 
 To change to a specific workspace, use the +workspace+ command, followed by the
 number or name of the workspace. To move containers to specific workspaces, use
-+move workspace+.
++move container to workspace+.
 
 You can also switch to the next and previous workspace with the commands
 +workspace next+ and +workspace prev+, which is handy, for example, if you have
 workspace 1, 3, 4 and 9 and you want to cycle through them with a single key
 combination. To restrict those to the current output, use +workspace
 next_on_output+ and +workspace prev_on_output+. Similarly, you can use +move
-workspace next+ and +move workspace prev+ to move a container to the
-next/previous workspace.
+container to workspace next+ and +move container to workspace prev+ to move a
+container to the next/previous workspace.
 
 [[back_and_forth]]
 To switch back to the previously focused workspace, use +workspace
@@ -1266,8 +1266,8 @@ bindsym mod+1 workspace 1
 bindsym mod+2 workspace 2
 ...
 
-bindsym mod+Shift+1 move workspace 1
-bindsym mod+Shift+2 move workspace 2
+bindsym mod+Shift+1 move container to workspace 1
+bindsym mod+Shift+2 move container to workspace 2
 ...
 
 # switch between the current and the previously focused one