iwm.4: move hardware list to .Sh HARDWARE and minor cleanup

Add devices supported by this driver to a HARDWARE section
for inclusion in the Release Hardware Compatibility Notes.

While here:
- license: add spdx license identifier tag
- synopsis: join a line for grep/brevity
- description: reflow for consistency, xref iwmfw(4)
- examples: use test-net-1 in cidr notation as example IPv4 address
- see also: add networking(7) quick start guide
- bugs: move 'incompatible modes' here for consistency/flow
- mention 802.11a support

MFC after:	3 days
Reported by:	bz (relnotes generation, cidr, test-net-1 ip4addr)
Reported by:	Graham Percival <gperciva@tarsnap.com> (no prompt)
Reviewed by:	bz
Differential Revision: https://reviews.freebsd.org/D47171

share/man/man4/iwm.4

@@ -1,3 +1,6 @@
+.\"-
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 2004-2006
 .\"	Damien Bergamini <damien.bergamini@free.fr>. All rights reserved.
 .\"
@@ -31,8 +34,7 @@
 .Nd Intel IEEE 802.11ac wireless network driver
 .Sh SYNOPSIS
 To compile this driver into the kernel,
-include the following lines in your
-kernel configuration file:
+include the following lines in your kernel configuration file:
 .Bd -ragged -offset indent
 .Cd "device iwm"
 .Cd "device pci"
@@ -79,55 +81,59 @@ iwm9260fw_load="YES"
 .Sh DESCRIPTION
 The
 .Nm
-driver provides support for:
-.Pp
-.Bl -tag -width Ds -offset indent -compact
-.It Intel Dual Band Wireless AC 3160
-.It Intel Dual Band Wireless AC 3165
-.It Intel Dual Band Wireless AC 3168
-.It Intel Dual Band Wireless AC 7260
-.It Intel Dual Band Wireless AC 7265
-.It Intel Dual Band Wireless AC 8260
-.It Intel Dual Band Wireless AC 8265
-.It Intel Dual Band Wireless AC 9260
-.It Intel Dual Band Wireless AC 9270
-.It Intel Dual Band Wireless AC 946X
-.It Intel Dual Band Wireless AC 9560
-.El
-.Pp
-.Nm
-supports
+driver supports running most Intel Wireless AC series network devices in
 .Cm station
 mode operation.
 Only one virtual interface may be configured at any time.
-For more information on configuring this device, see
-.Xr ifconfig 8 .
-.Pp
 This driver requires the firmware built with the
-.Nm iwmfw
+.Xr iwmfw 4
 module to work.
 .Pp
-Currently,
+For more information on configuring this device, see
+.Xr ifconfig 8 .
+.Sh HARDWARE
+The
 .Nm
-only supports 802.11b and 802.11g modes.
-It will not associate to access points that are configured to operate only
-in 802.11n or 802.11ac modes.
+driver supports the following PCIe Wi-Fi devices:
+.Pp
+.Bl -bullet -compact
+.It
+Intel Dual Band Wireless AC 3160
+.It
+Intel Dual Band Wireless AC 3165
+.It
+Intel Dual Band Wireless AC 3168
+.It
+Intel Dual Band Wireless AC 7260
+.It
+Intel Dual Band Wireless AC 7265
+.It
+Intel Dual Band Wireless AC 8260
+.It
+Intel Dual Band Wireless AC 8265
+.It
+Intel Dual Band Wireless AC 9260
+.It
+Intel Dual Band Wireless AC 9270
+.It
+Intel Dual Band Wireless AC 946X
+.It
+Intel Dual Band Wireless AC 9560
+.El
 .Sh EXAMPLES
 Join an existing BSS network (i.e., connect to an access point):
-.Bd -literal -offset indent
-ifconfig wlan create wlandev iwm0 inet 192.168.0.20 \e
-    netmask 0xffffff00
-.Ed
+.Pp
+.Dl ifconfig wlan create wlandev iwm0 inet 192.0.2.20/24
 .Pp
 Join a specific BSS network with network name
-.Dq Li my_net :
+.Ar my_net :
 .Pp
-.Dl "ifconfig wlan create wlandev iwm0 ssid my_net up"
+.Dl ifconfig wlan create wlandev iwm0 ssid my_net up
 .Pp
 Join a specific BSS network with 64-bit WEP encryption:
 .Bd -literal -offset indent
 ifconfig wlan create wlandev iwm0 ssid my_net \e
-	wepmode on wepkey 0x1234567890 weptxkey 1 up
+    wepmode on wepkey 0x1234567890 weptxkey 1 up
 .Ed
 .Pp
 Join a specific BSS network with 128-bit WEP encryption:
@@ -155,15 +161,16 @@ Verify the
 .Xr iwmfw 4
 firmware module is present.
 .It "iwm%d: could not load boot firmware"
-An attempt to upload the boot firmware image to the onboard microcontroller
-failed.
+An attempt to upload the boot firmware image
+to the onboard microcontroller failed.
 This should not happen.
 .It "iwm%d: could not load microcode"
-An attempt to upload the microcode image to the onboard microcontroller failed.
+An attempt to upload the microcode image
+to the onboard microcontroller failed.
 This should not happen.
 .It "iwm%d: could not load main firmware"
-An attempt to upload the main firmware image to the onboard microcontroller
-failed.
+An attempt to upload the main firmware image
+to the onboard microcontroller failed.
 This should not happen.
 .El
 .Sh SEE ALSO
@@ -174,5 +181,12 @@ This should not happen.
 .Xr wlan_ccmp 4 ,
 .Xr wlan_tkip 4 ,
 .Xr wlan_wep 4 ,
+.Xr networking 7 ,
 .Xr ifconfig 8 ,
 .Xr wpa_supplicant 8
+.Sh BUGS
+Currently,
+.Nm
+only supports 802.11a/b/g modes.
+It will not associate to access points that are configured to operate
+only in 802.11n/ac modes.