Update knowledge base entry on thread safety #167
Description
https://mbed-tls.readthedocs.io/en/latest/kb/development/thread-safety-and-multi-threading has out of date since the introduction of PSA. See Mbed-TLS/mbedtls#9991
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https://mbed-tls.readthedocs.io/en/latest/kb/development/thread-safety-and-multi-threading has out of date since the introduction of PSA. See Mbed-TLS/mbedtls#9991