wip(markdown): Dev docs update for v3

markdown/dev/reference/api/part/draft/unhide/en.md

@@ -0,0 +1,24 @@
+---
+title: unhide()
+---
+
+Calling `unhide()` in a part's draft method will mark the part as not hidden.
+
+<Tip>This method returns the `part` object, so it's chainable</Tip>
+
+<Related>
+
+The [hide](/reference/api/part/draft/hide) and
+[setHidden](/reference/api/part/draft/sethidden) methods also control a
+part's visibility
+
+</Related>
+
+## unhide() example
+
+```js
+cont part = {
+  name: 'examples.hide',
+  draft: ({ unhide, part }) =>  part.unhide()
+}
+```