Python Docs: remove example for using timers with separate threads

This appears to be unreliable.

Resolves #139602.

doc/python_api/examples/bpy.app.timers.5.py

@@ -1,28 +0,0 @@
-"""
-Use a Timer to react to events in another thread
-------------------------------------------------
-
-You should never modify Blender data at arbitrary points in time in separate threads.
-However you can use a queue to collect all the actions that should be executed when Blender is in the right state again.
-Pythons `queue.Queue` can be used here, because it implements the required locking semantics.
-"""
-import bpy
-import queue
-
-execution_queue = queue.Queue()
-
-
-# This function can safely be called in another thread.
-# The function will be executed when the timer runs the next time.
-def run_in_main_thread(function):
-    execution_queue.put(function)
-
-
-def execute_queued_functions():
-    while not execution_queue.empty():
-        function = execution_queue.get()
-        function()
-    return 1.0
-
-
-bpy.app.timers.register(execute_queued_functions)