Update rn-vendor-platform.md

Author: paigecalvert

docs/release-notes/rn-vendor-platform.md

@@ -15,7 +15,7 @@ This topic contains release notes for the Replicated Vendor Platform, which incl
 Released on March 27, 2025
 
 ### Bug Fixes {#bug-fixes-v2025-03-27-1}
-* if the custom domain override in the channel matches the default domain, do not fail validation on promoting an Embedded Cluster release.
+* If the custom domain override in the channel matches the default domain, do not fail validation on promoting an Embedded Cluster release.
 
 ## v2025.03.25-0