docs(differentia): fix type in comment

django/cantusdb_project/main_app/models/differentia.py

@@ -10,7 +10,7 @@ class Differentia(BaseModel):
         blank=True, null=True, max_length=255
     )  # values like `1--k-k-l-j-k-h--4` get stored here
     mode = models.CharField(blank=True, null=True, max_length=255)
-    # differentia database stores information on mode, but we don't expect to ever need to display it
+    # differentiae database stores information on mode, but we don't expect to ever need to display it
     # saeculorum - DD stores a volpiano snippet about the "saeculorum" part of the differentia, but we don't expect to ever need to display it
     # amen - DD stores a volpiano snippet about the "amen" part of the differentia, but we don't expect to ever need to display it