add oembed option-type description

options/built-in-option-types.rst

@@ -1018,6 +1018,30 @@ Choose font family, style, weight, size, line-height, letter-spacing and color.
     )
 
 
+Oembed
+------
+
+Generate oembed preview of the inserted link, for more details see `Embeds <https://codex.wordpress.org/Embeds>`__ in WordPress.
+
+.. code-block:: php
+
+    array(
+        'type'  => 'oembed'
+        'value' => 'https://vimeo.com/113078377',
+        'label' => __('Label', 'fw'),
+        'desc'  => __('Description', 'fw'),
+        'help'  => __('Help tip', 'fw'),
+        'preview' => array(
+            'width'  => 300, // optional, if you want to set the fixed width to iframe
+            'height' => 300, // optional, if you want to set the fixed height to iframe
+            /**
+             * if is set to false it will force to fit the dimensions,
+             * because some widgets return iframe with aspect ratio and ignore applied dimensions
+             */
+            'keep_ratio' => true
+        )
+    )
+
 WP Editor
 ---------