docs(man): document options implemented but missing from man pages

Sync man pages with the code for options that were read but undocumented:
- sway/workspaces: ignore-workspaces
- niri/workspaces: sort-by-number, hide-empty
- wayfire/workspaces: disable-scroll, enable-bar-scroll
- river/tags: set-tags, toggle-tags
- hyprland/workspaces: persistent-workspaces (formalized)
- hyprland/window: fallback, tooltip-format
- cpu: format-<state>, tooltip-format, tooltip-format-<state>
- pulseaudio/slider: ignored-sinks
- hyprland/niri/mango language: format-<lang>-<variant> (+ hyprland tooltip variant)

man/waybar-niri-workspaces.5.scd

@@ -32,6 +32,11 @@ Addressed by *niri/workspaces*
 	default: false ++
 	Sort workspaces by id, taking precedence over other sort options.
 
+*sort-by-number*: ++
+	typeof: bool ++
+	default: false ++
+	Deprecated alias for *sort-by-id*; prefer *sort-by-id* instead.
+
 If none of the sorting options are enabled, workspaces keep their output/index order.
 
 *format*: ++
@@ -58,6 +63,11 @@ If none of the sorting options are enabled, workspaces keep their output/index o
 	default: false ++
 	If set to true, only the active or focused workspace will be shown.
 
+*hide-empty*: ++
+	typeof: bool ++
+	default: false ++
+	If set to true, empty workspaces will not be shown.
+
 *on-update*: ++
 	typeof: string ++
 	Command to execute when the module is updated.