Add placeholder in the color input inside the create new label popup

app/views/shared/issuable/_label_page_create.html.haml

@@ -9,7 +9,7 @@
           &nbsp
     .dropdown-label-color-input
       .dropdown-label-color-preview.js-dropdown-label-color-preview
-      %input#new_label_color.default-dropdown-input{ type: "text" }
+      %input#new_label_color.default-dropdown-input{ type: "text", placeholder: "Assign custom color like #FF0000" }
     .clearfix
       %button.btn.btn-primary.pull-left.js-new-label-btn{ type: "button" }
         Create

changelogs/unreleased/issue-24512.yml

+---
+title: Add placeholder for the example text for custom hex color on label creation popup
+merge_request: 
+author: Luis Alonso Chavez Armendariz