Added comm after rankter

docs/latest/menu.json

@@ -123,7 +123,7 @@
  {"slug": "knowledge-graph", "title": "Knowledge Graph"},
  {"slug": "graph-retriever", "title": "Graph Retriever"},
  {"slug": "question-generator", "title": "Question Generator"},
- {"slug": "ranker", "title": "Ranker"}
+ {"slug": "ranker", "title": "Ranker"},
  {"slug": "document-classifier", "title": "Document Classifier"},
  ]
  }