Update dataviews readme with new pickerTable layout.

[tellthemachines]

What?

Follow-up from #72914.

Adds info about new picker layout type to dataviews readme.

[tellthemachines]

No, I don't think this needs a changelog entry 😂

[github-actions]

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Co-authored-by: tellthemachines <isabel_brison@git.wordpress.org>
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[andrewserong]

Oh good catch, thanks for updating the docs! LGTM

[andrewserong]

This is such an insignificant note that I want to say "please ignore this comment" before I even type it out! But for this example, I'd probably go with showMedia: true on each of the layouts and showTitle: false on grid, and showTitle: true on the table layout. Anyway, just a thought!

[tellthemachines]

Hmm both these properties are true by default so we don't really need to set them; I think this started out as a contrived example for the dataviews defaultLayouts.

We could instead go with a more realistic example like

pickerGrid: {
		showTitle: false,
	},
	pickerTable: {},

[andrewserong]

Sounds good!

[github-actions]

Flaky tests detected in afae715.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/19451518156
📝 Reported issues:

• [Flaky Test] should paginate #69568 in /test/e2e/specs/site-editor/user-global-styles-revisions.spec.js