fix(edge): fix edge URL placeholder EE-2598 (#7459)

app/edge/components/group-form/groupForm.html

@@ -11,7 +11,7 @@
         required
         auto-focus
         data-cy="edgeGroupCreate-groupNameInput"
-        placeholder="e.g. mystack"
+        placeholder="e.g. mygroup"
       />
     </div>
   </div>

app/react/portainer/environments/wizard/EnvironmentsCreationView/shared/EdgeAgentTab/EdgeAgentForm/PortainerUrlField.tsx

@@ -45,7 +45,7 @@ export function PortainerUrlField({ fieldName, readonly }: Props) {
         id={id}
         name={fieldName}
         as={Input}
-        placeholder="e.g. 10.0.0.10:9443 or portainer.mydomain.com"
+        placeholder="e.g. https://10.0.0.10:9443 or https://portainer.mydomain.com"
         required
         data-cy="endpointCreate-portainerServerUrlInput"
         readOnly={readonly}