Update nerdgraph-rag.mdx

Added callout on visibility of indexed documents.

Author: toobagrrl

src/content/docs/apis/nerdgraph/examples/nerdgraph-rag.mdx

@@ -55,6 +55,10 @@ mutation {
 
 ### Upload a document to the Blob API [#upload-document]
 
+<Callout variant={Callout.VARIANT.IMPORTANT} title={null}>
+  All indexed documents are visible to all users within your organization.  Make sure the documents you index comply with your internal policies for use of the Services.
+</Callout>
+
 * Note that this specific step is not through NerdGraph. This is because NerdGraph does support file uploads through it's APIs.
 
 ```shell