DOC-4927 Added FQDN validation method change to version changes in 7.22 release notes

Author: rrelledge

content/operate/rs/release-notes/rs-7-22-releases/_index.md

@@ -43,6 +43,8 @@ For more detailed release notes, select a build version from the following table
 
 ## Version changes
 
+- The fully qualified domain name is now validated using the FQDN library instead of a regex during cluster creation.
+
 ### Deprecations
 
 #### API deprecations

content/operate/rs/release-notes/rs-7-22-releases/rs-7-22-x-tba.md

@@ -195,6 +195,8 @@ The following table shows which Redis modules are compatible with each Redis dat
 
 ## Version changes
 
+- The fully qualified domain name is now validated using the FQDN library instead of a regex during cluster creation.
+
 ### Deprecations
 
 #### API deprecations