mem-cache: Fix description for writeback_clean.

The description explains when we have to set this True (when a
downstream cache acts as a victim cache). Also, it describes general
(default) setup, but this seems inaccurate and not consistent with
default vaule.

Change-Id: I389adb0af0d6421e8a9672c4cf5d23510eb38242
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/62832
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed