Change documentation for Mapbox Studio in docker container

docs/mapbox-studio-in-docker.md

@@ -31,26 +31,24 @@ the appropriate port in Kitematic on OSX).
 
 ### Choose Project
 
-The `open-streets.tm2source` project is mounted to `/tm2source`.
-To start editing open the source project from this path.
+The `open-streets.tm2source` project is mounted to the `/projects` folder.
+Choose existing project and open open the source project from this path.
 
 ### Authorize Mapbox Studio on OSX
 
 Mapbox Studio redirects the OAuth requests to localhost. Because Docker
-is not native on OSX this is a bit problematic.
+is running on a virtual machine on OSX on a different IP this does not work.
 
-On the first start for the authorizing you need to forward localhost traffic
-on port `3000` to the remote docker host.
-
-Install netcat.
+You will receive the following OAuth callback in the browser which results in a `ERR_CONNECTION_REFUSED` error on OSX.
 
 ```
-brew install netcat
+http://localhost:3000/oauth/mapbox?code=XQBLTQ2...
 ```
 
-Pipe incoming traffic to docker container and pipe outcoming traffic from container back. Look for your local Docker IP in the Kitematic interface.
+Change the hostname of the URL to your Docker IP address and make the OAuth callback yourself.
 
 ```
-mkfifo backpipe
-nc -l 3000 | nc 192.168.99.100 3000 1> backpipe
+http://192.168.99.100/oauth/mapbox?code=XQBLTQ2...
 ```
+
+This only needs to be done the first time your start up Mapbox Studio in a Docker container.