Uses admonition for nanoGPT example

Author: pranavm-nvidia

tripy/examples/nanogpt/README.md

@@ -63,9 +63,6 @@ Use `--quant-mode` in `example.py` to enable quantization. Supported modes:
 
 - Weight-only `int4` quantization:
 
-    **Warning**: For this model, `int4` quantization may result in poor accuracy.
-        We include it only to demonstrate the workflow.
-
     ```bash
     python3 example.py --input-text "What is the answer to life, the universe, and everything?" --seed=0 --quant-mode int4-weight-only
     ```
@@ -76,3 +73,6 @@ Use `--quant-mode` in `example.py` to enable quantization. Supported modes:
     ```
     Tripy: TEST: EXPECTED_STDOUT End
     -->
+
+> [!WARNING]
+> For this model, `int4` quantization may result in poor accuracy. We include it only to demonstrate the workflow.