fix: restore commented example in DDEV config

The additional_hostnames edit also replaced a commented example and left
uncommented list items behind, which made the YAML unreadable.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

.ddev/config.yaml

@@ -299,13 +299,7 @@ corepack_enable: false
 # or
 # web_environment: []
 # or
-# additional_hostnames:
-    - sbw-ep13
-    - snowzone-ep13
-    - snowbreak-ep13
-    - ser-ep13
-    - alvac-ep13
-    - cllt-ep13
+# additional_hostnames: []
 # can have their intended effect. 'override_config' affects only behavior of the
 # config.*.yaml file it exists in.