single quotes around attribute (#166)

Author: aimurphy

antora.yml

@@ -47,7 +47,7 @@ asciidoc:
     starlight-kafka: 'Starlight for Kafka'
     starlight-rabbitmq: 'Starlight for RabbitMQ'
     gpt-schema-translator: 'GPT schema translator'
-    astra-streaming-examples-repo: https://github.com/datastax/astra-streaming-examples
+    astra-streaming-examples-repo: 'https://github.com/datastax/astra-streaming-examples'
 
     # Required for include::common partials; some shared with Luna Streaming
     web-ui: '{astra-ui}'