Fix documentation box

Signed-off-by: Patrick Bloebaum <bloebp@amazon.com>

Author: bloebp

README.rst

@@ -20,11 +20,9 @@
 \
 ===============================
 
-.. admonition:: `Checkout the documentation <https://py-why.github.io/dowhy/>`_
-
-    The documentation, user guide, sample notebooks and other information are available at:
-
-        `https://py-why.github.io/dowhy <https://py-why.github.io/dowhy/>`_
+> [!IMPORTANT]  `Checkout the documentation <https://py-why.github.io/dowhy/>`_
+> The documentation, user guide, sample notebooks and other information are available at:
+> `https://py-why.github.io/dowhy <https://py-why.github.io/dowhy/>`_
 
 **For any questions, comments, or discussions about specific use cases, join our community on Discord:** |discord|_