Fix documentation

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/docs/architecture/tls13-support.md b/docs/architecture/tls13-support.md
index 722ac63..bef3a35 100644
--- a/docs/architecture/tls13-support.md
+++ b/docs/architecture/tls13-support.md
@@ -164,7 +164,7 @@
   | MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED    | n/a     |
   | MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED     | n/a     |
   |                                          |         |
-  | MBEDTLS_USE_PSA_CRYPTO                   | no  (3) |
+  | MBEDTLS_USE_PSA_CRYPTO                   | no      |
 
   (1) Some support has already been upstreamed but it is incomplete.
   (2) Key exchange configuration options for TLS 1.3 will likely to be