apply suggestion from PR and edit readme

README.md

@@ -57,4 +57,4 @@ In order to execute code submissions using Docker, source code files are written
 
 
 ## Additional Note
-- As the underlying rails server uses port 3000 as the default seeting, you can use [authbind] (https://www.mwells.org/coding/2016/authbind-port-80-443/) to bind it to the regular 80/443 port.
+- If you want to change the default port of the underlying rails server, you can use [authbind] (https://www.mwells.org/coding/2016/authbind-port-80-443/) to bind it to the regular 80/443 port.

docs/LOCAL_SETUP.md

@@ -165,7 +165,7 @@ sudo apt update && sudo apt install docker-ce docker-ce-cli containerd.io
   - Execute: `sudo usermod -aG docker ${USER}`
   - Logout and login again
 - Check the docker installation with `docker run hello-world` (without root privileges)
-- Get the lateste version of the execution environment you want to use with `docker pull`
+- Get the latest version of the execution environment you want to use with `docker pull`
 
 ### RVM and Ruby