nl82011: clarify interface combinations wrt. channels

Thinking about MLD (Draft 802.11be) now, it's clear that
we'll have new limitations where different stations (or
links) must be on _different_ channels (or in different
frequency ranges even.) Clarify that the current limit of
multiple channels is a maximum and the same one is OK.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20211201110924.2816d91b6862.I2d997abd525574529f88e941d90aeb640dbb1abf@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/uapi/linux/nl80211.h

@@ -5578,7 +5578,7 @@ enum nl80211_iface_limit_attrs {
  *	=> allows 8 of AP/GO that can have BI gcd >= min gcd
  *
  *	numbers = [ #{STA} <= 2 ], channels = 2, max = 2
- *	=> allows two STAs on different channels
+ *	=> allows two STAs on the same or on different channels
  *
  *	numbers = [ #{STA} <= 1, #{P2P-client,P2P-GO} <= 3 ], max = 4
  *	=> allows a STA plus three P2P interfaces