[TASK] Display warning for internal ViewHelpers (#629)

Author: linawolf

packages/typo3-docs-theme/resources/template/body/directive/viewhelper.html.twig

@@ -8,6 +8,13 @@
                     {{ docTag }}
                 </article>
             </div>
+        {% elseif key == '@internal' %}
+            <div class="admonition warning" role="alert">
+                <p class="admonition-title">Internal</p>
+                <p>This ViewHelper is marked as internal. It is subject to be
+                    changed without notice. Use at your own risk.</p>
+            </div>
+        {% elseif key == '@api' %}
         {% else %}
             <p>{{ key }}: {{ docTag }}</p>
         {% endif %}

tests/Integration/tests/viewhelper/expected/index.html

@@ -275,6 +275,23 @@ <h2>Source code</h2>
 </p>
 
 
+    </section>
+            <section class="section" id="formvh-be-maximumfilesize">
+            <h2>formvh:be.maximumFileSize<a class="headerlink" href="#formvh-be-maximumfilesize" data-bs-toggle="modal" data-bs-target="#linkReferenceModal"  title="Reference this headline">¶</a></h2>
+                                    <div class="admonition warning" role="alert">
+                <p class="admonition-title">Internal</p>
+                <p>This ViewHelper is marked as internal. It is subject to be
+                    changed without notice. Use at your own risk.</p>
+            </div>
+
+
+    <p>Return the max file size for use in the form editor</p>
+
+    <p>Scope: backend</p>
+
+
+
+
     </section>
     </section>
         <!-- content end -->

tests/Integration/tests/viewhelper/input/index.rst

@@ -19,3 +19,10 @@ f:deprecated
 
 ..  typo3:viewhelper:: deprecated
     :source: resources/global_viewhelpers_demo.json
+
+
+formvh:be.maximumFileSize
+=========================
+
+..  typo3:viewhelper:: be.maximumFileSize
+    :source: resources/Form.json