Fixed indentation of RabbitMQ binding spec (#2586)

This is my commit message
Signed-off-by: Malte Goetz

Signed-off-by: Malte Götz <maltegoetz@users.noreply.github.com>

Co-authored-by: Mark Fussell <markfussell@gmail.com>

daprdocs/content/en/reference/components-reference/supported-bindings/rabbitmq.md

@@ -38,7 +38,7 @@ spec:
     value: false
   - name: maxPriority
     value: 5
-- name: contentType
+  - name: contentType
     value: "text/plain"
 ```