gc docs: git gc --keep-base-pack ?

[Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx>]

Hi,

In git-gc.1, in the part describing gc.bigPackThreshold
there is two references to an option '--keep-base-pack'
but there is no such option (and it doesn't seem to
correspond to '--keep-largest-pack').

Regards,
-- Luc