Fix typos discovered by codespell (#134)

examples/play_file.py

@@ -40,7 +40,7 @@ def print_error(*args):
 
 
 def xrun(delay):
-    print_error("An xrun occured, increase JACK's period size?")
+    print_error("An xrun occurred, increase JACK's period size?")
 
 
 def shutdown(status, reason):
@@ -109,7 +109,7 @@ def process(frames):
 except KeyboardInterrupt:
     parser.exit('\nInterrupted by user')
 except (queue.Full):
-    # A timeout occured, i.e. there was an error in the callback
+    # A timeout occurred, i.e. there was an error in the callback
     parser.exit(1)
 except Exception as e:
     parser.exit(type(e).__name__ + ': ' + str(e))

src/jack.py

@@ -729,7 +729,7 @@ def set_shutdown_callback(self, callback):
 
                After server shutdown, the client is *not* deallocated by
                JACK, the user (that's you!) is responsible to properly
-               use `close()` to release client ressources.
+               use `close()` to release client resources.
                Alternatively, the `Client` object can be used as a
                *context manager* in a *with statement*, which takes care
                of activating, deactivating and closing the client
@@ -1256,7 +1256,7 @@ def set_xrun_callback(self, callback):
         ----------
         callback : callable
             User-supplied function that is called whenever an xrun has
-            occured.  It must have this signature::
+            occurred.  It must have this signature::
 
                 callback(delayed_usecs: float) -> None