Update lua-developer-faq.md
lua-users wiki page for Learning Lua changed.
@@ -33,7 +33,7 @@ The NodeMCU firmware implements Lua 5.1 over the Espressif SDK for its ESP8266 S
- The official lua.org **[Lua Language specification](http://www.lua.org/manual/5.1/manual.html)** gives a terse but complete language specification.
- Its [FAQ](http://www.lua.org/faq.html) provides information on Lua availability and licensing issues.
- The **[unofficial Lua FAQ](http://www.luafaq.org/)** provides a lot of useful Q and A content, and is extremely useful for those learning Lua as a second language.
-- The [Lua User's Wiki](http://lua-users.org/wiki/) gives useful example source and relevant discussion. In particular, its [Lua Learning Lua](http://lua-users.org/wiki/Learning) section is a good place to start learning Lua.
+- The [Lua User's Wiki](http://lua-users.org/wiki/) gives useful example source and relevant discussion. In particular, its [Lua Learning Lua](http://lua-users.org/wiki/LearningLua) section is a good place to start learning Lua.
- The best book to learn Lua is *Programming in Lua- by Roberto Ierusalimschy, one of the creators of Lua. It's first edition is available free [online](http://www.lua.org/pil/contents.html) . The second edition was aimed at Lua 5.1, but is out of print. The third edition is still in print and available in paperback. It contains a lot more material and clearly identifies Lua 5.1 vs Lua 5.2 differences. **This third edition is widely available for purchase and probably the best value for money**. References of the format [PiL **n.m**] refer to section **n.m** in this edition.
- The Espressif ESP8266 architecture is closed source, but the Espressif SDK itself is continually being updated so the best way to get the documentation for this is to [google Espressif IoT SDK Programming Guide](https://www.google.co.uk/search?q=Espressif+IoT+SDK+Programming+Guide) or to look at the Espressif [downloads forum](http://bbs.espressif.com/viewforum.php?f=5).
