style.mdoc: HARDWARE generates Release Notes

FreeBSD Release Infrastructure has been building the
Hardware Release Notes from these subsections in the
Kernel Interfaces Manual. Standardize this behavior
in the FreeBSD Manual page style guide.

Reported by:	bz
MFC after:	3 days

share/man/man5/style.mdoc.5

@@ -74,6 +74,29 @@ Historically,
 was the preferred way before the deprecation of
 .Sy \&Li .
 .El
+.Ss HARDWARE Section
+Driver manuals in section four should have a
+.Sx HARDWARE
+section with a subsection for the type of hardware supported.
+This enables clean generation of Hardware Release Notes.
+.Pp
+Supported subsections are as follows:
+.Pp
+.Bl -tag -offset indent -compact
+.It Sx Disk Controllers
+.It Sx Ethernet Interfaces
+.It Sx FDDI Interfaces
+.It Sx Wireless Network Interfaces
+.It Sx Miscellaneous Networks
+.It Sx Serial Interfaces
+.It Sx Sound Devices
+.It Sx Cameras and Video Capture Devices
+.It Sx Sound Devices
+.It Sx IEEE 1394 (Firewire) Devices
+.It Sx Bluetooth Devices
+.It Sx Cryptographic Accelerators
+.It Sx Miscellaneous
+.El
 .Ss EXAMPLES Section
 .Bl -dash -width ""
 .It