docs(ag-ui): remove unnecessary quotes in ag-ui.md

Author: stevenh

docs/ag-ui.md

@@ -286,7 +286,7 @@ can be run from a clone of the repo or with the `pydantic-ai-examples` package
 installed with either of the following:
 
 ```bash
-pip/uv-add 'pydantic-ai-examples'
+pip/uv-add pydantic-ai-examples
 ```
 
 Direct: