fixed TLS build comment

examples/mqtt-client/main.c

@@ -8,8 +8,7 @@
 //    4. Receives that message back from the subscribed topic and closes
 //    5. Timer-based reconnection logic revives the connection when it is down
 //
-// To enable SSL/TLS for this client, build it like this:
-//    make MBEDTLS_DIR=/path/to/your/mbedtls/installation
+// To enable SSL/TLS, make SSL=OPENSSL or make SSL=MBEDTLS 
 
 #include "mongoose.h"