Clarify that what we're dropping is pkcs11-helper support
The PKCS11 module does not directly interface with PKCS#11 (also known
as Cryptoki), but with the pkcs11-helper library.
diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 62f5446..0983d0f 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2812,7 +2812,7 @@
/**
* \def MBEDTLS_PKCS11_C
*
- * Enable wrapper for PKCS#11 smartcard support.
+ * Enable wrapper for PKCS#11 smartcard support via the pkcs11-helper library.
*
* \deprecated This option is deprecated and will be removed in a future
* version of Mbed TLS.