aacraid.4: Fix document description + tag SPDX

The document description previously just stated the name of the driver.
Replace this with the name of the controller families and specs that
it supports, in a similar fashion to other RAID drivers.

MFC after:	3 days

Author: concussious

share/man/man4/aacraid.4

@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 2013 Achim Leubner
 .\" All rights reserved.
 .\"
@@ -21,12 +24,12 @@
 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
-.Dd June 19, 2015
+.Dd September 29, 2025
 .Dt AACRAID 4
 .Os
 .Sh NAME
 .Nm aacraid
-.Nd Adaptec AACRAID Controller driver
+.Nd Adaptec Series 6/7/8 6G and 12G SAS+SATA RAID controller driver
 .Sh SYNOPSIS
 To compile this driver into the kernel,
 place the following lines in your