Update README.md.

Fixes #737.

[ci skip]

README.md

@@ -55,7 +55,7 @@ Ratchet's documentation is built with [Jekyll](http://jekyllrb.com) and publicly
 1. If necessary, [install Jekyll](http://jekyllrb.com/docs/installation) (requires v2.5.x).
   - **Windows users:** Read [this unofficial guide](http://jekyll-windows.juthilo.com/) to get Jekyll up and running without problems.
 2. Install the Ruby-based syntax highlighter, [Rouge](https://github.com/jneen/rouge), with `gem install rouge`.
-3. From the root `/ratchet/docs` directory, run `jekyll serve` in the command line.
+3. From the root `/ratchet` directory, run `jekyll serve` in the command line.
 4. Open <http://localhost:4000> in your browser, and boom!
 
 Learn more about using Jekyll by reading its [documentation](http://jekyllrb.com/docs/home/).