Fix logging typo.

Author: mickp

microscope/devices.py

@@ -259,7 +259,7 @@ def shutdown(self):
         try:
             self.disable()
         except Exception as e:
-            _logger.debug("Exeption in disable() during shutdown: %s" % e)
+            _logger.debug("Exception in disable() during shutdown: %s" % e)
         _logger.info("Shutting down ... ... ...")
         self._on_shutdown()
         _logger.info("... ... ... ... shut down completed.")