Add SSL/TLS remarks (#1333)

docs/en/modules/http.md

@@ -19,6 +19,10 @@ For each operation it is also possible to include custom headers. Note that foll
 
 The `Host` header is taken from the URL itself, the `Connection` is always set to `close`, and the `User-Agent` is `ESP8266`.
 
+**SSL/TLS support**
+
+Take note of constraints documented in the [net module](net.md). 
+
 ## http.delete()
 
 Executes a HTTP DELETE request. Note that concurrent requests are not supported.

docs/en/modules/mqtt.md

@@ -88,7 +88,7 @@ Connects to the broker specified by the given host, port, and secure options.
 #### Parameters
 - `host` host, domain or IP (string)
 - `port` broker port (number), default 1883
-- `secure` 0/1 for `false`/`true`, default 0. [As per #996](https://github.com/nodemcu/nodemcu-firmware/issues/996#issuecomment-178053308) secure connections use **TLS 1.1** with the following cipher suites: `TLS_RSA_WITH_AES_128_CBC_SHA`, `TLS_RSA_WITH_AES_256_CBC_SHA`, `TLS_RSA_WITH_RC4_128_SHA`, and `TLS_RSA_WITH_RC4_128_MD5`. 
+- `secure` 0/1 for `false`/`true`, default 0. Take note of constraints documented in the [net module](net.md).
 - `autoreconnect` 0/1 for `false`/`true`, default 0
 - `function(client)` callback function for when the connection was established
 - `function(client, reason)` callback function for when the connection could not be established

docs/en/modules/net.md

@@ -3,6 +3,17 @@
 | :----- | :-------------------- | :---------- | :------ |
 | 2014-12-22 | [Zeroday](https://github.com/funshine) | [Zeroday](https://github.com/funshine) | [net.c](../../../app/modules/net.c)|
 
+**SSL/TLS support**
+
+Secure connections use **TLS 1.1** with the following cipher suites:
+
+- `TLS_RSA_WITH_AES_128_CBC_SHA`
+- `TLS_RSA_WITH_AES_256_CBC_SHA`
+- `TLS_RSA_WITH_RC4_128_SHA`
+- `TLS_RSA_WITH_RC4_128_MD5`
+
+This specification is imposed by the [axTLS library](http://axtls.sourceforge.net/specifications.htm) used by the SDK. 
+
 
 ## Constants
 Constants to be used in other functions: `net.TCP`, `net.UDP`