Fix pip command (#225)

Author: demjened

example-apps/chatbot-rag-app/README.md

@@ -193,7 +193,7 @@ python -m venv .venv
 source .venv/bin/activate
 
 # Install Python dependencies
-pip install -r api/requirements.txt
+pip install -r requirements.txt
 
 # Install Node dependencies
 cd frontend && yarn && cd ..