Merge pull request #8495 from KOTungseth/docs/fix-blank-rns

[DOCS] Specifies no known issue and deprecations for 9.0.0

Author: marciw

docs/release-notes/deprecations.md

@@ -16,9 +16,6 @@ Review the deprecated functionality for Elasticsearch .NET Client. While depreca
 % **Action**<br> Steps for mitigating deprecation impact.
 % ::::
 
-% ## 9.0.0 [elasticsearch-net-client-900-deprecations]
+## 9.0.0 [elasticsearch-net-client-900-deprecations]
 
-% Description of the deprecation and steps to update implementation.
-% For more information, check [PR #](PR link).
-% **Impact**<br>
-% **Action**<br>
+_No deprecations_

docs/release-notes/known-issues.md

@@ -5,6 +5,8 @@ navigation_title: "Known issues"
 
 # Elasticsearch .NET Client known issues [elasticsearch-net-client-known-issues]
 
+Known issues are significant defects or limitations that may impact your implementation. These issues are actively being worked on and will be addressed in a future release. Review the Elasticsearch .NET Client known issues to help you make informed decisions, such as upgrading to a new version.
+
 % Use the following template to add entries to this page.
 
 % :::{dropdown} Title of known issue
@@ -17,4 +19,6 @@ navigation_title: "Known issues"
 % **Resolved**
 % On [Month/Day/Year], this issue was resolved.
 
-:::
+:::
+
+_No known issues_