true parent commits, without taking grafts nor history
simplification into account.
-* 'format:'
+* 'format:<string>'
+
-The 'format:' format allows you to specify which information
+The 'format:<string>' format allows you to specify which information
you want to show. It works a little bit like printf format,
with the notable exception that you get a newline with '%n'
instead of '\n'.