Update docs/docs/jupyter/streamable-http/standalone/index.mdx

Co-authored-by: Eric Charles <[email protected]>

Author: eleonorecharles

docs/docs/jupyter/streamable-http/standalone/index.mdx

@@ -17,7 +17,7 @@ To confirm your environment is correctly configured:
 1. Open a notebook in JupyterLab
 2. Type some content in any cell (code or markdown)
 3. Observe the tab indicator: you should see an "×" appear next to the notebook name, indicating unsaved changes
-4. Wait a few seconds—the "×" should automatically change to a "○" without manually saving
+4. Wait a few seconds—the "×" should automatically change to a "●" without manually saving
 
 This automatic saving behavior confirms that the real-time collaboration features are working properly, which is essential for MCP server integration.
 :::