Added notice for short content field

Author: ihorvansach

view/adminhtml/ui_component/blog_post_form.xml

@@ -176,6 +176,26 @@
                 </item>
             </argument>
         </field>
+    </fieldset>
+    <fieldset name="short_content">
+        <argument name="data" xsi:type="array">
+            <item name="config" xsi:type="array">
+                <item name="collapsible" xsi:type="boolean">true</item>
+                <item name="label" xsi:type="string" translate="true">Short Content</item>
+                <item name="sortOrder" xsi:type="number">15</item>
+            </item>
+        </argument>
+        <container name="short_content_notice">
+            <argument name="data" xsi:type="array">
+                <item name="config" xsi:type="array">
+                    <item name="label" xsi:type="boolean">false</item>
+                    <item name="content" xsi:type="string" translate="true"><![CDATA[
+                        <strong>Notice:</strong> <em>Please use this section only if you need to enter short content completely different from main content.<br/>Please <a href="https://magefan.com/blog/add-read-more-tag-to-blog-post-content/" target="_blank" title="Add &quot;read more&quot; tag to Magento 2 blog post content">read more</a> about how to configure "read more" tag.</em>
+                    ]]></item>
+                    <item name="template" xsi:type="string">ui/form/components/complex</item>
+                </item>
+            </argument>
+        </container>
         <field name="short_content">
             <argument name="data" xsi:type="array">
                 <item name="config" xsi:type="array">