Apply suggestion from @jouni

Co-authored-by: Jouni Koivuviita <[email protected]>

Author: MarcinVaadin

articles/flow/configuration/feature-flags.adoc

@@ -29,7 +29,7 @@ dl code {
 A component for building UIs with a horizontally or vertically split pair consisting of a master area and a detail area that can responsively switch to an overlay. <</components/master-detail-layout#,Learn More>>
 
 `copilotExperimentalFeatures`::
-Experimental, not stable new features of Vaadin Copilot.
+Experimental Vaadin Copilot features.
 
 
 == Managing Feature Flags