Update docs/getting_started.md
Update docs/getting_started.md

Co-Authored-By: Gilles Peskine <f829db02715a0ea34b7c8e25097dae9e3517e831@arm.com>
Mbed-TLS/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,Mbed-TLS/mbedtls,NXPmicro/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,NXPmicro/mbedtls,ARMmbed/mbedtls,ARMmbed/mbedtls