Unify indentation in example project structure

site/content/user_guide.md

@@ -4,13 +4,13 @@ While you are welcome to provide your own organization, typically a Cobra-based
 application will follow the following organizational structure:
 
 ```console
-  ▾ appName/
-    ▾ cmd/
-        add.go
-        your.go
-        commands.go
-        here.go
-      main.go
+▾ appName/
+  ▾ cmd/
+      add.go
+      your.go
+      commands.go
+      here.go
+  main.go
 ```
 
 In a Cobra app, typically the main.go file is very bare. It serves one purpose: initializing Cobra.