Update: Dotnet sample app documentation

Author: tanure

content/guides/dotnet/containerize.md

@@ -34,7 +34,7 @@ Open a terminal, change directory to a directory that you want to work in, and
 run the following command to clone the repository.
 
 ```console
-$ git clone https://github.com/docker/docker-dotnet-sample
+$ git clone https://github.com/docker/docker-dotnet-sample && cd docker-dotnet-sample
 ```
 
 ## Initialize Docker assets

content/guides/dotnet/develop.md

@@ -103,7 +103,7 @@ services:
     secrets:
       - db-password
     volumes:
-      - db-data:/var/lib/postgresql/data
+      - db-data:/var/lib/postgresql
     environment:
       - POSTGRES_DB=example
       - POSTGRES_PASSWORD_FILE=/run/secrets/db-password