They might want to update the documentation then because in the latest MIB guide ( ArubaOS_6-1.1MG.pdf ) -
Information from Any AP
wlsrConfigTable.1.3.6.1.4.1.14823.2.3.1.1.1.1
The following information can be retrieved from an AP:
Current configuration of SSID, Mode, Current Channel, Tx-Power, RTS Threshold, Retry Limit, Preamble, Beacon Interval, Power Mgmt, Load Balance, Supported Rates, DTIM Period, LMS Address, Encryption, Status, Ageout, MTU, Location, Hide SSID, Deny Broadcast, BG mode, Radio Chipset, Regulatory Domain, Country Code, and Tx Rates.
snmpwalk -v 2c -m ALL -c <community name> <AP IP addr> .1.3.6.1.4.1.14823.2.3.1.1.1.1