Fix typo

Author: pstephengoogle

src/a2a/server/events/event_consumer.py

@@ -16,7 +16,7 @@
 from a2a.utils.telemetry import SpanKind, trace_class
 
 
-# This is an alias to the execption for closed queue
+# This is an alias to the exception for closed queue
 QueueClosed = asyncio.QueueEmpty
 
 # When using python 3.13 or higher, the closed queue signal is QueueShutdown