Fix link to Code Wiki in README.md

Author: holtskinner

README.md

@@ -6,7 +6,7 @@
 [![PyPI - Downloads](https://img.shields.io/pypi/dw/a2a-sdk)](https://pypistats.org/packages/a2a-sdk)
 [![Python Unit Tests](https://github.com/a2aproject/a2a-python/actions/workflows/unit-tests.yml/badge.svg)](https://github.com/a2aproject/a2a-python/actions/workflows/unit-tests.yml)
 <!-- markdownlint-disable no-inline-html -->
-<a href="https://codewiki.google/github.com/a2aproject/a2a">
+<a href="https://codewiki.google/github.com/a2aproject/a2a-python">
   <img src="https://www.gstatic.com/_/boq-sdlc-agents-ui/_/r/Mvosg4klCA4.svg" alt="Ask Code Wiki" height="20">
 </a>