docs: update banners

Author: mrholek

docs/content/forms/autocomplete.md

@@ -6,6 +6,7 @@ group: forms
 toc: true
 bootstrap: true
 pro_component: true
+preview_component: true
 ---
 
 ## Overview

docs/layouts/partials/banner.html

@@ -11,9 +11,9 @@
 {{ end }}
 {{ if .Page.Params.preview_component }}
   <div class="bg-warning bg-opacity-10 border-start border-start-5 border-start-warning p-4 pb-3 mb-5">
-    <h3 class="mb-4">Alpha release</h3>
+    <h3 class="mb-4">Release candidate (RC)</h3>
     <p>
-      This component is in the Alpha phase and has an experimental API, which can be changed in the final release. If you want to use this component, please install <strong>@coreui/coreui-pro {{ .Page.Params.preview_component }}</strong>
+      This component is in the Release Candidate phase and its API is considered stable. Minor adjustments may still occur before the final release.
     </p>
   </div>
 {{ end }}