fix link
add limitations of tls connection
In WiFi.config, if we pass 0.0.0.0 for all three parameters (as local_ip, gateway and subnet mask), it will re enable the DHCP. We need to re connect the device to get the IP from router.
Corrected some typos and improved grammar
* New section with ESP8266WiFi library documentation * ESP8266WiFi library documentation 1. Introduction - example, diagnostic, doxygen 2. Station - examples, new doc 3. Soft Access Point - examples, new doc 4. Scan - examples, new doc 5. Client - examples, ref. Arduino, setNoDelay, list of functions 6. Client Secure - examples, loadCertificate, setCertificate, list of functions 7. Server- examples, ref. Arduino, setNoDelay, list of functions 8. UDP - examples, ref. Arduino, Multicast UDP 9. Generic - examples, onEvent, WiFiEventHandler, persistent, mode, list of functions * Fixed numbered list