Remove mbedtls_ssl_conf_sig_hashes from comments

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
diff --git a/programs/fuzz/fuzz_client.c b/programs/fuzz/fuzz_client.c
index 1840570..0878480 100644
--- a/programs/fuzz/fuzz_client.c
+++ b/programs/fuzz/fuzz_client.c
@@ -137,7 +137,7 @@
     }
 #endif
     //There may be other options to add :
-    // mbedtls_ssl_conf_cert_profile, mbedtls_ssl_conf_sig_hashes
+    // mbedtls_ssl_conf_cert_profile
 
     if (mbedtls_ssl_setup(&ssl, &conf) != 0) {
         goto exit;