cleanup: fix typos in comments and docs

Followup to https://developer.blender.org/D10288

Reviewed By: Blendify

Differential Revision: https://developer.blender.org/D10346

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

@@ -11,7 +11,7 @@ import queue
 
 execution_queue = queue.Queue()
 
-# This function can savely be called in another thread.
+# 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)