Contact > Form > Refactoring notation

Author: rafaelstz

app/code/Magento/Contact/view/frontend/templates/form.phtml

@@ -30,7 +30,7 @@
         <div class="field telephone">
             <label class="label" for="telephone"><span><?= $block->escapeHtml(__('Phone Number')) ?></span></label>
             <div class="control">
-                <input name="telephone" id="telephone" title="<?= $block->escapeHtmlAttr(__('Phone Number')) ?>" value="<?= $block->escapeHtmlAttr($this->helper('Magento\Contact\Helper\Data')->getPostValue('telephone')) ?>" class="input-text" type="tel" />
+                <input name="telephone" id="telephone" title="<?= $block->escapeHtmlAttr(__('Phone Number')) ?>" value="<?= $block->escapeHtmlAttr($this->helper(\Magento\Contact\Helper\Data::class)->getPostValue('telephone')) ?>" class="input-text" type="tel" />
             </div>
         </div>
         <div class="field comment required">