fix strange comment typo

lms/envs/common.py

@@ -72,7 +72,7 @@ MITX_FEATURES = {
     'ENABLE_TEXTBOOK': True,
     'ENABLE_DISCUSSION_SERVICE': True,
     # discussion home panel, which includes a subscription on/off setting for discussion digest emails.
-    # this glano longer needed once 
+    # this should remain off in production until digest notifications are online. 
     'ENABLE_DISCUSSION_HOME_PANEL': True,
 
     'ENABLE_PSYCHOMETRICS': False,  # real-time psychometrics (eg item response theory analysis in instructor dashboard)