openai: fix broken link (#3248)

Author: minimAluminiumalism

instrumentation-genai/opentelemetry-instrumentation-openai-v2/README.rst

@@ -119,7 +119,7 @@ For more details, refer to the `OpenTelemetry GenAI Metrics documentation <https
 
 References
 ----------
-* `OpenTelemetry OpenAI Instrumentation <https://opentelemetry-python-contrib.readthedocs.io/en/latest/instrumentation/openai/openai.html>`_
+* `OpenTelemetry OpenAI Instrumentation <https://opentelemetry-python-contrib.readthedocs.io/en/latest/instrumentation-genai/openai.html>`_
 * `OpenTelemetry Project <https://opentelemetry.io/>`_
 * `OpenTelemetry Python Examples <https://github.com/open-telemetry/opentelemetry-python/tree/main/docs/examples>`_