Merge "Update usage guidelines for UNKNOWN" into main

    ENCR_AES_CBC = 100,

    AUTH_HMAC_SHA2_256_128 = 101,

    /** Unknown */

    /** Misc placeholders */

    // Unknown is now reserved for cases involving DRBs where an integrity algorithm

    // is not assigned (which is different from a null algorithm being used) but a

    // notification based solely on the integrity algorithm should not be triggered.

    UNKNOWN = 113,

    // Currently unused

    OTHER = 114,

    /** For proprietary algorithms */