pack-write/docs: update regarding pack naming

pack-write/docs: update regarding pack naming

The index-pack documentation explicitly states that the pack
name is derived from the sorted list of object names, but
since commit 1190a1acf800 ("pack-objects: name pack files
after trailer hash") that isn't true anymore.

Be less explicit in the docs as to what the exact output is,
and just say that it's whatever goes into the pack name.

Also update a comment on write_idx_file() since it no longer
modifies the sha1 variable (it's const now anyway), as noted
by Junio.

Fixes: 1190a1acf800 ("pack-objects: name pack files after trailer hash")
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>