Clarify root user password input label

Author: ujibang

_includes/root-user-config.html

@@ -56,7 +56,7 @@ <h3 class="mb-3">🔧 Configuration</h3>
     </div>
 
     <div class="col-md-3">
-      <label class="form-label fw-bold">Password</label>
+      <label class="form-label fw-bold">Root user password to set</label>
       <input
         type="text"
         style="text-security: disc; -webkit-text-security: disc"