STA-23, 24, 25, 38 and CEL-12, 34, 35, 36: source is extremely outdated and unclear

[samz-cs]

all threats mentioned refer to this source: https://www.3gpp.org/ftp/tsg_sa/wg3_security/_specs/Old_Vsns/21133-400.pdf

The document was published in 2001 and provides unclear descriptions of threats. The descriptions in the document are the same as the descriptions in the MTC.

Proposed change: Delete these threats or find a new resource covering these threats