added lambda example for Neptune

Author: scmacdon

.doc_gen/metadata/cross_metadata.yaml

@@ -5,7 +5,7 @@ cross_Neptune_Query:
   synopsis: create lambda functions that query graph data.
   category: Scenarios
   languages:
-    .Java:
+    Java:
       versions:
         - sdk_version: 2
           block_content: cross_Neptune_Java_block.xml