modules: add Module Name section to the module reference docs

src/modules/module-fallback-sink.c

@@ -23,6 +23,15 @@
  *
  * Fallback sink, which appear dynamically when no other sinks are
  * present. This is only useful for Pulseaudio compatibility.
+ *
+ * ## Module Name
+ *
+ * `libpipewire-module-fallback-sink`
+ *
+ * ## Module Options
+ *
+ * - `sink.name`: sink name
+ * - `sink.description`: sink description
  */
 
 #define NAME "fallback-sink"