Block attributes docs: missing Saved content code block in example of multiline prop usage

[vasartam]

What problem does this address?

In the html section of Block Attributes page there is a "Saved content" code block missing. Because of that, for a person who is at the stage of researching the Gutenberg capabilities it is unclear what multiline prop does when using source: 'html' in block attribute definition:

gutenberg/docs/reference-guides/block-api/block-attributes.md

Lines 276 to 292 in 0897b17

	Use the `multiline` property to extract the inner HTML of matching tag names for the use in `RichText` with the `multiline` prop.
	```js
	{
	content: {
	type: 'string',
	source: 'html',
	multiline: 'p',
	selector: 'blockquote',
	}
	}
	```
	Attribute available in the block:
	```js
	{ "content": "<p>First line</p><p>Second line</p>" }
	```

What is your proposed solution?

There should be a "Saved content" code block example just before the attribute definition example, as it's done in the example right above:

gutenberg/docs/reference-guides/block-api/block-attributes.md

Lines 249 to 274 in 0897b17

	Use `html` to extract the inner HTML from markup. Note that text is returned according to the rules of [`innerHTML`](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/innerHTML).
	Saved content:
	```html
	<figure>
	<img src="/image.jpg" />
	<figcaption>The inner text of the <strong>figcaption</strong> element</figcaption>
	</figure>
	```
	Attribute definition:
	```js
	attributes {
	content: {
	type: 'string',
	source: 'html',
	selector: 'figcaption',
	}
	}
	```
	Attribute available in the block:
	```js
	{ "content": "The inner text of the <strong>figcaption</strong> element" }
	```

I would have created this code block myself in the PR #41468, but I myself don't exactly know how this feature works.

[t-hamano]

@vasartam

Thank you for submitting the issue.
I have submitted a PR at #43075 for consistency, including the points you raised.