docs(singlestoredb): change yields to returns

Author: kesmit13

ibis/backends/singlestoredb/__init__.py

@@ -410,8 +410,8 @@ def begin(self) -> Generator[Any, None, None]:
         handles transaction lifecycle including rollback on exceptions
         and proper cleanup.
 
-        Yields
-        ------
+        Returns
+        -------
         Cursor
             SingleStoreDB cursor for executing SQL commands