Update references to old Github organisation

Replace references to ARMmbed organisation with the new
org, Mbed-TLS, following project migration.

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/include/mbedtls/config_psa.h b/include/mbedtls/config_psa.h
index 68dda0f..dd3554d 100644
--- a/include/mbedtls/config_psa.h
+++ b/include/mbedtls/config_psa.h
@@ -515,7 +515,7 @@
 #if !defined(MBEDTLS_PSA_ACCEL_ECC_SECP_K1_224)
 /*
  * SECP224K1 is buggy via the PSA API in Mbed TLS
- * (https://github.com/ARMmbed/mbedtls/issues/3541).
+ * (https://github.com/Mbed-TLS/mbedtls/issues/3541).
  */
 #error "SECP224K1 is buggy via the PSA API in Mbed TLS."
 #define MBEDTLS_ECP_DP_SECP224K1_ENABLED
@@ -776,7 +776,7 @@
 #define PSA_WANT_ECC_SECP_K1_192
 #endif
 
-/* SECP224K1 is buggy via the PSA API (https://github.com/ARMmbed/mbedtls/issues/3541) */
+/* SECP224K1 is buggy via the PSA API (https://github.com/Mbed-TLS/mbedtls/issues/3541) */
 #if 0 && defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
 #define MBEDTLS_PSA_BUILTIN_ECC_SECP_K1_224 1
 #define PSA_WANT_ECC_SECP_K1_224