Clarify what is meant by "block wrapper" in documentation (#30315)

* Clarify what is meant by "block wrapper"

* Callout fragment and SSR specifically

docs/reference-guides/block-api/block-edit-save.md

@@ -46,7 +46,7 @@ var blockSettings = {
 
 ### block wrapper props
 
-The first thing to notice here is the use of the `useBlockProps` React hook on the block wrapper element. In the example above, the block wrapper renders a "div" in the editor, but in order for the Gutenberg editor to know how to manipulate the block, add any extra classNames that are needed for the block... the block wrapper element should apply props retrieved from the `useBlockProps` react hook call.
+The first thing to notice here is the use of the `useBlockProps` React hook on the block wrapper element. In the example above, the block wrapper renders a "div" in the editor, but in order for the Gutenberg editor to know how to manipulate the block, add any extra classNames that are needed for the block... the block wrapper element should apply props retrieved from the `useBlockProps` react hook call. The block wrapper element should be a native DOM element, like `<div>` and `<table>`, or a React component that forwards any additional props to native DOM elements. Using a `<Fragment>` or `<ServerSideRender>` component, for instance, would be invalid.
 
 If the element wrapper needs any extra custom HTML attributes, these need to be passed as an argument to the `useBlockProps` hook. For example to add a `my-random-classname` className to the wrapper, you can use the following code: