Explicit node value doc for the block tag

docs/1.0.md

@@ -950,6 +950,8 @@ In plain language, the sequence of discovery an ingesting platform should use is
 ### Attributes
  - **id** (optional) A single entry from the [service slug list](https://github.com/Podcastindex-org/podcast-namespace/blob/main/serviceslugs.txt).
 
+### Node value
+  The node value must be "yes" or "no".
 
 ### Examples
 ```xml