Add a blog link to the docs-usability README (#91)

Author: AndrejKiri

end-user-surveys/docs-usability/README.md

@@ -8,4 +8,4 @@ The purpose the OpenTelemetry Communications SIG gather insights about the usabi
 
 * [CSV survey results](/end-user-surveys/docs-usability/otel-docs-usability-survey.csv)
 * [PDF survey results](/end-user-surveys/docs-usability/otel-docs-usability-survey.pdf)
-* Blog summary of survey results (coming soon)
+* [Blog summary of survey results](https://opentelemetry.io/blog/2024/otel-docs-survey)