Update plugin-document-setting-panel.md bad import reference

[andersrehn]

What?

Fix reference error found in documentation on PluginDocumentSettingPanel

Why?

When you follow the code examples you get non-compiling code as PluginDocumentSettingPanel is undefined when using the editor library instead of edit-post

How?

Updates the documentation to use the correct library where PluginDocumentSettingPanel can be found

Changes imports from @wordpress/editor to @wordpress/edit-post

Testing Instructions

Tested on WP 6.5.3
Built with node packages:
@wordpress/scripts 27.8.0
@wordpress/components 27.5.0

Create a simple WP Block and use the demo code. Compile using npm run build. Include the block or built JavaScript, there should be no undefined PluginDocumentSettingPanel now.

import { registerPlugin } from '@wordpress/plugins';
import { PluginDocumentSettingPanel } from '@wordpress/edit-post';
const PluginDocumentSettingPanelDemo = () => (
    <PluginDocumentSettingPanel
        name="lime-custom-panel"
        title="Custom Panel"
        className="lime-custom-panel"
    >
        Custom Panel Contents
    </PluginDocumentSettingPanel>
);

registerPlugin('plugin-document-setting-panel-demo', {
    render: PluginDocumentSettingPanelDemo,
    icon: 'palmtree',
});

Testing Instructions for Keyboard

N/A

Screenshots or screencast

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[github-actions]

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[youknowriad]

Thanks for opening this PR, I understand that it's confusing at the moment but there's actually no issues because the documentation in "trunk" matches the code in "trunk" which will land in WordPress in 6.6.

That said, we still need to see how to pin the live site to 6.5 instead. See #61657