vector/nonvector capitalization (#35)

Author: aimurphy

antora.yml

@@ -20,8 +20,8 @@ asciidoc:
     product: 'Astra CLI'
     product-short: 'Astra'
     product-version: '1.0'
-    db-serverless: 'Serverless (Non-Vector)'
-    db-serverless-vector: 'Serverless (Vector)'
+    db-serverless: 'Serverless (non-vector)'
+    db-serverless-vector: 'Serverless (vector)'
     db-classic: 'Managed Cluster'
     devops-api: 'DevOps API'
     astra-stream: 'Astra Streaming'