fix(query_list): Fix docstrings in exceptions

Author: tony

src/libtmux/_internal/query_list.py

@@ -33,11 +33,11 @@ def __call__(
 
 
 class MultipleObjectsReturned(Exception):
-    """The requested object does not exist."""
+    """The query returned multiple objects when only one was expected."""
 
 
 class ObjectDoesNotExist(Exception):
-    """The query returned multiple objects when only one was expected."""
+    """The requested object does not exist."""
 
 
 def keygetter(