OSDOCS-16490: adds feature gates release note MicroShift

Author: ShaunaDiaz

modules/microshift-4-21-new-features-enhancements.adoc

@@ -10,23 +10,27 @@
 This release adds improvements related to the following components and concepts.
 
 //4.21 is not an EUS release, so one minor version update is supported
-[id="microshift-4-21-placeholder-feature1_{context}"]
-== placeholder feature 1
+[id="microshift-4-21-feature-gates_{context}"]
+== Feature gates now available for developers
+
+As an application developer, you now can experiment with upcoming Kubernetes features to evaluate their potential benefits for specific use cases. Enable feature gates to test new functions for current or future deployments. With this release, you can experiment with capabilities such as advanced CPU management, enhanced scheduling features, or experimental storage options. For more information, see the following link:
+
+//* xref:microshift_configuring/microshift-feature-gates.adoc#microshift-feature-gates[Using feature gates to develop solutions]
 
 //TODO add new features and enhancements as needed
-[id="microshift-4-21-placeholder-feature2_{context}"]
-== placeholder feature 2
+//[id="microshift-4-21-placeholder-feature2_{context}"]
+//== placeholder feature 2
 
 //TODO add new features and enhancements as needed
-[id="microshift-4-21-placeholder-feature3_{context}"]
-== placeholder feature 3
+//[id="microshift-4-21-placeholder-feature3_{context}"]
+//== placeholder feature 3
 
 //etc
 
-[id="microshift-4-21-doc-enhancements_{context}"]
-== Documentation enhancements
+//[id="microshift-4-21-doc-enhancements_{context}"]
+//== Documentation enhancements
 
-* enhancement bullet placeholder 1
+//* enhancement bullet placeholder 1
 
-* enhancement bullet placeholder 2
+//* enhancement bullet placeholder 2