remove a changelog record that was duplicated by mistake

Author: ItayGibel-helios

CHANGELOG.md

@@ -34,8 +34,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `opentelemetry-instrumentation-tornado` Add support instrumentation for Tornado 5.1.1
   ([#812](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/812))
 
-- `opentelemetry-instrumentation-flask` Flask: Conditionally create SERVER spans
-  ([#828](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/828))
 
 ## [1.7.1-0.26b1](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.7.0-0.26b0) - 2021-11-11