Improvement on web server (#215)

source/plugins/achievements/metadata.yml

@@ -44,6 +44,7 @@ inputs:
     type: array
     format: comma-separated
     default: ""
+    example: octonaut, automater, explorer
 
   # List of unlocked achievements to display
   # Names must be given in lower case, without rank adjective
@@ -52,4 +53,5 @@ inputs:
     description: Unlocked achievements to display
     type: array
     format: comma-separated
-    default: ""
+    default: ""
+    example: octonaut, automater, explorer