docs: fix files outside the web root example (#1971)

Author: jaymitchell

docs/guides/going-buildless/serving.md

@@ -50,10 +50,10 @@ Likewise, if you were to rename `index.html` to `main.html`, then `https://my-do
 
 ### Files Outside the Web Root
 
-In the above examples, the server used the default web root `/var/www/html`, but we could also have configured it to use `/var/www/html/about`, e.g. by changing into that directory and starting a server from the command line
+In the above examples, the server used the default web root `/var/www/html`, but we could also have configured it to use `/var/www/html/about`, e.g. by changing into that directory and starting a server from the command line:
 
 ```
-cd /var/www/about
+cd /var/www/html/about
 http-server
 ```