updated greeting text

app.py

@@ -55,9 +55,9 @@ css="""
 
 title = """
 <div style="text-align: center;max-width: 700px;">
-    <h1>Chat with PDF</h1>
-    <p style="text-align: center;">Upload a .PDF from your computer, click the "Load PDF to LangChain" button, <br />
-    when everything is ready, you can start asking questions about the pdf ;)</p>
+    <h1>Chat with the RAY Docs</h1>
+    <p style="text-align: center;">The AI bot is here to help you with the RAY Documentation, <br />
+    start asking questions about the open-source software </p>
 </div>
 """