Ability to remove minetest.after once set (#10103)

doc/lua_api.txt

@@ -5336,10 +5336,13 @@ Sounds
 Timing
 ------
 
-* `minetest.after(time, func, ...)`
+* `minetest.after(time, func, ...)` : returns job table to use as below.
     * Call the function `func` after `time` seconds, may be fractional
     * Optional: Variable number of arguments that are passed to `func`
 
+* `job:cancel()`
+    * Cancels the job function from being called
+
 Server
 ------