Updated Developer Guide (markdown)

Developer-Guide.md

@@ -59,22 +59,10 @@ or
 
 depending on your OS and Python installation.
 
-To install the Node.js dependences run
+To install the Node.js dependencies run
 
     $ npm install
 
-Optionally, you can also install JSDoc 3. Installing JSDoc 3 is necessary
-if you want to run the full integration suite.
-
-To get JSDoc from GitHub:
-
-    $ git clone git://github.com/jsdoc3/jsdoc.git
-    $ cd jsdoc
-    $ git checkout v3.2.2
-
-Again, the `jsdoc` executable, located at the root of `jsdoc` repository,
-should be in your `PATH`.
-
 Note: another way to set up your development environment is to use Hadrien Tulipe's [Docker image](https://github.com/htulipe/ol3-docker-env). This will create a virtual Ubuntu machine with all the dependencies installed for you.
 
 ## Working with the build tool