maintenance: use 'git fetch --prefetch'

maintenance: use 'git fetch --prefetch'

The 'prefetch' maintenance task previously forced the following refspec
for each remote:

	+refs/heads/*:refs/prefetch/<remote>/*

If a user has specified a more strict refspec for the remote, then this
prefetch task downloads more objects than necessary.

The previous change introduced the '--prefetch' option to 'git fetch'
which manipulates the remote's refspec to place all resulting refs into
refs/prefetch/, with further partitioning based on the destinations of
those refspecs.

Update the documentation to be more generic about the destination refs.
Do not mention custom refspecs explicitly, as that does not need to be
highlighted in this documentation. The important part of placing refs in
refs/prefetch/ remains.

Reported-by: Tom Saeger <tom.saeger@oracle.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>