Add docstring for get_favicons

favicon/models.py

@@ -56,6 +56,11 @@ class Favicon(models.Model):
         verbose_name_plural = 'Favicons'
 
     def get_favicons(self, update=False):
+        """
+        Get all combinations of favicons as configured, creating mising ones.
+
+        Pass update=True to force re-generation of existing icons.
+        """
         # Get all combinations of favicon rels and sizes from config
         query = Q()
         for rel in config: