s/wakup/wakeup (GH-20250)

(as title)

Automerge-Triggered-By: @Mariatta
(cherry picked from commit f2947e3)

Co-authored-by: Kunal Bhalla <[email protected]>

Author: miss-islington

Lib/asyncio/unix_events.py

@@ -101,7 +101,7 @@ def add_signal_handler(self, sig, callback, *args):
 
         try:
             # Register a dummy signal handler to ask Python to write the signal
-            # number in the wakup file descriptor. _process_self_data() will
+            # number in the wakeup file descriptor. _process_self_data() will
             # read signal numbers from this file descriptor to handle signals.
             signal.signal(sig, _sighandler_noop)