Update documentation.

Author: yangli0516

Markdowns/1. Server API/9. Publications.md

@@ -1,5 +1,9 @@
 # Publications
 
+```{note}
+The endpoints documented in this page don't need authentication as they are published data.
+```
+
 ## Collection Publications
 
 ### Get the information about a publication
@@ -122,6 +126,22 @@ The IIIF manifest of the published image set.
 
 ## Annotation Set Publications
 
+### Get the data of a publication
+
+```
+GET /publications/annotation-sets/{publication_id}/json
+```
+
+Get a published annotation set data by its publication ID.
+
+#### URL parameters
+
+- `publication_id`: The ID of the publication.
+
+#### Response
+
+The annotation set object containing all annotation objects from the annotation set.
+
 ### Get the IIIF manifest of a publication
 
 ```