"Amend" is used for written work, but is rather formal and usually means that the meaning has been modified in the process. "Revise" also might mean that the meaning is changed. If the corrections are largely just grammar or spelling related, I would use either "edit" or, simply, "correct" instead. p.s.- "Mend" is for fixing things, like a bicycle tire or clothing, for example.

It 's better to say I would like to amend/revise your composition.