Re: [PATCH] Clean up documentation that references deprecated 'git peek-remote'.

Johannes Sixt [off-list ref] writes:

Now that 'git peek-remote' is deprecated and only an alias for
'git ls-remote', it should not be referenced from other manual pages.

This also removes the description of the --exec option, which is no
longer present.

It seems to be supported as a backward compatibility option but not
shown in the short help.  Removal of it from the documentation is
alright nevertheless.

Thanks.