trimmed notes further

docs/releases/v0.21.0.md

@@ -9,17 +9,9 @@
 - [v0.58.0](https://github.com/open-telemetry/opentelemetry-collector/releases/tag/v0.58.0)
 - [v0.57.2](https://github.com/open-telemetry/opentelemetry-collector/releases/tag/v0.57.2)
 
-**Implemented enhancements:**
-
-- Export OTEL traces with Auth extension [\#1056](https://github.com/aws-observability/aws-otel-collector/issues/1056)
-
 **Merged pull requests:**
 
-- Update fargate deployment template to use include in cumulativetodelta processor [\#1435](https://github.com/aws-observability/aws-otel-collector/pull/1435) ([vasireddy99](https://github.com/vasireddy99))
-- Modify mirroring tool to use `crane` go pkg [\#1417](https://github.com/aws-observability/aws-otel-collector/pull/1417) ([erichsueh3](https://github.com/erichsueh3))
 - Update upstream collector dependancies to v0.58.0 [\#1414](https://github.com/aws-observability/aws-otel-collector/pull/1414) ([vasireddy99](https://github.com/vasireddy99))
-- Upgrade ADOT Collector version to v0.20.0 [\#1385](https://github.com/aws-observability/aws-otel-collector/pull/1385) ([Kausik-A](https://github.com/Kausik-A))
-- Add operator arm64 tests [\#1365](https://github.com/aws-observability/aws-otel-collector/pull/1365) ([erichsueh3](https://github.com/erichsueh3))