Update CHANGELOG.md (#105)

* Update CHANGELOG.md

update change log for expected error.

* Update CHANGELOG.md

fix formatting

* Modified Release notes to link to specific config section, slight rewording

* Modified Release notes to link to specific config section, slight rewording

* Removed links to docs

* more details on changelog

* typo

Co-authored-by: Jason Feingold <[email protected]>

Author: vuqtran88

src/Agent/CHANGELOG.md

@@ -9,16 +9,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * **The .NET Agent is now open source!** <br/>
 The New Relic .NET agent is now open source! Now you can view the source code to help with troubleshooting, observe the project roadmap, and file issues directly in this repository.  We are now using the [Apache 2 license](/LICENSE). See our [Contributing guide](/CONTRIBUTING.md) and [Code of Conduct](/CODE_OF_CONDUCT.md) for details on contributing!
 
+* **Expected Errors Support** <br/>
+Certain errors that are expected within the application may be identified so that they will not be counted towards the application's error rate and Apdex Score.  Only errors that truly affect the health of the application will be alerted on.  Please review the following [documentation](https://docs.newrelic.com/docs/agents/net-agent/configuration/net-agent-configuration#error_collector) for details on how to configure Expected Errors.
+
+* **Ignored Errors Enhancements** <br/>
+Certain errors may be identified in configuration so that they will be ignored.  These errors will not be counted towards the application's error rate, Apdex score, and will not be reported by the agent. Please review the following [documentation](https://docs.newrelic.com/docs/agents/net-agent/configuration/net-agent-configuration#error_collector) for details on how to configure Ignored Errors.
+    * New configuration element [`<ignoreMessages>`](https://docs.newrelic.com/docs/agents/net-agent/configuration/net-agent-configuration#error-ignoreErrors)supports filtering based on the error message. 
+    * Please note that the [`<ignoreErrors>`](https://docs.newrelic.com/docs/agents/net-agent/configuration/net-agent-configuration#error-ignoreErrors) configuration element has been deprecated and replaced by [`<ignoreClasses>`](https://docs.newrelic.com/docs/agents/net-agent/configuration/net-agent-configuration#error-ignoreClasses).  The .NET Agent continues to support this configuration element, but its support may be removed in the future.
+
 ### Fixes
 * **Garbage Collection Performance Metrics for Windows** <br/>
 Fixes an issue where Garbage Collection Performance Metrics may not be reported for Windows Applications.
 
 * **Maintaining newrelic.config on Linux package upgrades** <br/>
 Fixes an issue where `newrelic.config` was being overwritten when upgrading the agent via either `rpm`/`yum` (RedHat/Centos) or `dpkg`/`apt` (Debian/Ubuntu).
- 
-### Docs Changes
-* [Doc Title](https://urlToDraft)
-
 
 ## [8.30] - 2020-07-15
 ### Fixes