[src-draft/trunk]: src/share/man/man9 Enhance TX setup description.

[Martin Husemann <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src-all/rev/6dd56cd099e0
branches:  trunk
changeset: 371159:6dd56cd099e0
user:      Martin Husemann <martin%NetBSD.org@localhost>
date:      Mon Aug 15 17:17:12 2022 +0200

description:
Enhance TX setup description.

Provide more details about TX rate selection and point at the need
to update radiotap headers.

diffstat:

 share/man/man9/usbwifi.9 |  5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diffs (15 lines):

diff -r 6180dedfa276 -r 6dd56cd099e0 share/man/man9/usbwifi.9
--- a/share/man/man9/usbwifi.9  Mon Aug 08 04:52:02 2022 +1000
+++ b/share/man/man9/usbwifi.9  Mon Aug 15 17:17:12 2022 +0200
@@ -264,6 +264,11 @@
 Prepare an mbuf for transmit.
 .Pq Required .
 Called with the Tx lock held.
+If the driver supports radiotap headers, the transmit header should be
+updated here (if needed).
+The transmit rate to use for this mbuf chain can be found from the
+target node uwc_ni which has a ni_txparms pointer pointing to a
+.Va const struct ieee80211_txparam .
 .El
 .It uw_intr
 Pointer to a