wpa_cli.8: describe better + tag spdx + linter nit

"how do I switch active wifi network on console"
"% apropos wifi"

MFC after:	3 days
Reviewed by:	mhorne, imp
Pull Request:	#1299

usr.sbin/wpa/wpa_cli/wpa_cli.8

@@ -1,3 +1,6 @@
+.\"-
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 2005 Sam Leffler <sam@errno.com>
 .\" All rights reserved.
 .\"
@@ -22,12 +25,12 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd January 24, 2017
+.Dd June 21, 2024
 .Dt WPA_CLI 8
 .Os
 .Sh NAME
 .Nm wpa_cli
-.Nd "text-based frontend program for interacting with wpa_supplicant"
+.Nd console utility for WiFi authentication with wpa_supplicant
 .Sh SYNOPSIS
 .Nm wpa_cli
 .Op Fl p Ar path_to_ctrl_sockets
@@ -118,7 +121,7 @@ The
 .Nm
 utility
 shows these requests with a
-.Dq Li CTRL-REQ- Ns Ao Ar type Ac Ns Li - Ns Ao Ar id Ac Ns : Ns Aq Ar text
+.Dq Li CTRL-REQ- Ns Ao Ar type Ac Ns Li - Ns Ao Ar id Ac : Ns Aq Ar text
 prefix, where
 .Aq Ar type
 is