Add Cowboy manual to README

README.md

@@ -21,9 +21,9 @@ No parameterized module. No process dictionary. **Clean** Erlang code.
 Getting Started
 ---------------
 
- *  [Read the guide](http://ninenines.eu/docs/en/cowboy/HEAD/guide/introduction)
+ *  [Read the guide](http://ninenines.eu/docs/en/cowboy/HEAD/guide)
+ *  [Check the manual](http://ninenines.eu/docs/en/cowboy/HEAD/manual)
  *  Look at the examples in the `examples/` directory
- *  Build API documentation with `make docs`; open `doc/index.html`
 
 Support
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