The usb(4) synopsys could use some modernization regarding device tree
attachments. Insert paragraph breaks to make it pretty along with ehci(4),
ohci(4) and xhci(4) at fdt?. 

Add a subsection for arm specific listings starting with mtxhci(4).

input and ok from jmc@

ok?

Index: share/man/man4/usb.4
===================================================================
RCS file: /cvs/src/share/man/man4/usb.4,v
retrieving revision 1.220
diff -u -p -r1.220 usb.4
--- share/man/man4/usb.4	7 Oct 2024 07:35:40 -0000	1.220
+++ share/man/man4/usb.4	26 Mar 2025 18:43:10 -0000
@@ -36,12 +36,20 @@
 .Nm uhub
 .Nd introduction to Universal Serial Bus support
 .Sh SYNOPSIS
+.Cd "# arm specific"
+.Cd "mtxhci* at fdt?"
+.Cd "usb*    at mtxhci?"
+.Pp
 .Cd "# octeon specific"
 .Cd "dwctwo0 at iobus? irq 56"
+.Pp
 .Cd "# all architectures"
 .Cd "ehci*   at cardbus?"
 .Cd "ohci*   at cardbus?"
 .Cd "uhci*   at cardbus?"
+.Cd "ehci*   at fdt?"
+.Cd "ohci*   at fdt?"
+.Cd "xhci*   at fdt?"
 .Cd "ehci*   at pci?"
 .Cd "ohci*   at pci?"
 .Cd "uhci*   at pci?"