Resolve "Docs feedback: Specify location of Dockerfile"

doc/topics/autodevops/index.md

@@ -373,7 +373,7 @@ Either way, the resulting Docker image is automatically pushed to the
 
 #### Auto Build using a Dockerfile
 
-If a project's repository contains a `Dockerfile`, Auto Build will use
+If a project's repository contains a `Dockerfile` at its root, Auto Build will use
 `docker build` to create a Docker image.
 
 If you are also using Auto Review Apps and Auto Deploy and choose to provide