NetworkPkg/IScsiDxe: reformat IScsiHexToBin() leading comment block

NetworkPkg/IScsiDxe: reformat IScsiHexToBin() leading comment block

We'll need further return values for IScsiHexToBin() in a subsequent
patch; make room for them in the leading comment block of the function.
While at it, rewrap the comment block to 80 characters width.

No functional changes.

Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3356
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210608121259.32451-8-lersek@redhat.com>