minor #5492 updated tree for front controller (OskarStark)

This PR was submitted for the 2.7 branch but it was merged into the 2.3 branch instead (closes #5492).

Discussion
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updated tree for front controller

Commits
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65dca62 updated tree for front controller

Author: xabbuh

create_framework/front-controller.rst

@@ -146,11 +146,13 @@ web root directory:
 
     example.com
     ├── composer.json
-    │   src
+    ├── composer.lock    
+    ├── src
     │   └── pages
     │       ├── hello.php
     │       └── bye.php
     ├── vendor
+    │   └── autoload.php
     └── web
         └── front.php