wpa_supplicant: Clarify group_rekey documentation

This is also used in mesh and AP modes.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

wpa_supplicant/wpa_supplicant.conf

@@ -937,7 +937,7 @@ fast_reauth=1
 #
 # group_rekey: Group rekeying time in seconds. This value, if non-zero, is used
 # as the dot11RSNAConfigGroupRekeyTime parameter when operating in
-# Authenticator role in IBSS.
+# Authenticator role in IBSS, or in AP and mesh modes.
 #
 # Following fields are only used with internal EAP implementation.
 # eap: space-separated list of accepted EAP methods