Short answer: you can't.
Slightly longer answer: since the object name is calculated from data
including the commit message, there is no way you can change it.
However, you can start from a certain commit in history, and _recommit_ a
commit. There, you can edit the message and rebase the other commits on
top of it. NOTE: the resulting commit is _not_ easily mergeable for people
who track your branch.
Hth,
Dscho
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