Fix minor formatting and comments issues.

beets/dbcore/db.py

@@ -505,7 +505,7 @@ class Results(object):
         predicate.
         """
         if self.sort:
-            # slow sort, must build the full list first
+            # Slow sort. Must build the full list first.
             objects = []
             for row in self.rows:
                 obj = self._generate_results(row)

beets/dbcore/query.py

@@ -535,7 +535,7 @@ class Sort(object):
 
 
 class MultipleSort(Sort):
-    """ Sort class that combines several sort criteria.
+    """Sort class that combines several sort criteria.
     This implementation tries to implement as many sort operation in sql,
     falling back to python sort only when necessary.
     """

beets/dbcore/queryparse.py

@@ -150,4 +150,4 @@ def sort_from_strings(model_cls, sort_parts):
     sort = query.MultipleSort()
     for part in sort_parts:
         sort.add_criteria(construct_sort_part(model_cls, part))
-    return sort
+    return sort

beets/library.py

@@ -942,10 +942,10 @@ def get_query(val, model_cls):
         # Add path queries to aggregate query.
         if path_parts:
             query.subqueries += [PathQuery('path', s) for s in path_parts]
-        return (query, sort)
+        return query, sort
 
     elif isinstance(val, dbcore.Query):
-        return (val, None)
+        return val, None
 
     else:
         raise ValueError('query must be None or have type Query or str')