update header to reflect custom version of Magma model in app.py

app.py

@@ -51,7 +51,7 @@ caption_model_processor = None
 
 MARKDOWN = """
 <div align="center">
-<h2>Magma: A Foundation Model for Multimodal AI Agents</h2>
+<h2>Custom Magma: A Foundation Model for Multimodal AI Agents</h2>
 
 \[[arXiv Paper](https://www.arxiv.org/pdf/2502.13130)\] &nbsp; \[[Project Page](https://microsoft.github.io/Magma/)\] &nbsp; \[[Github Repo](https://github.com/microsoft/Magma)\] &nbsp; \[[Hugging Face Model](https://huggingface.co/microsoft/Magma-8B)\] &nbsp;