nl80211: don't document per-wiphy interface dump

Such a feature doesn't exist and isn't really needed since you
probably won't have enough interfaces to make it worthwhile, so
just remove that from the documentation.

Reported-by: booto [on IRC]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/uapi/linux/nl80211.h

@@ -180,8 +180,8 @@
  *	%NL80211_ATTR_WIPHY and %NL80211_ATTR_WIPHY_NAME.
  *
  * @NL80211_CMD_GET_INTERFACE: Request an interface's configuration;
- *	either a dump request on a %NL80211_ATTR_WIPHY or a specific get
- *	on an %NL80211_ATTR_IFINDEX is supported.
+ *	either a dump request for all interfaces or a specific get with a
+ *	single %NL80211_ATTR_IFINDEX is supported.
  * @NL80211_CMD_SET_INTERFACE: Set type of a virtual interface, requires
  *	%NL80211_ATTR_IFINDEX and %NL80211_ATTR_IFTYPE.
  * @NL80211_CMD_NEW_INTERFACE: Newly created virtual interface or response