File Block: Remove the "Show Download Button" toggle help text

As per discussion in #13429, this help text is redundant and can be removed.

There's still some discussion to be had about adding some sort of "on/off" text to clarify the state for toggles like this, but that should be tackled globally.

packages/block-library/src/file/inspector.js

@@ -10,10 +10,6 @@ import {
 import { Fragment } from '@wordpress/element';
 import { InspectorControls } from '@wordpress/editor';
 
-function getDownloadButtonHelp( checked ) {
-	return checked ? __( 'The download button is visible.' ) : __( 'The download button is hidden.' );
-}
-
 export default function FileBlockInspector( {
 	hrefs,
 	openInNewWindow,
@@ -51,7 +47,6 @@ export default function FileBlockInspector( {
 				<PanelBody title={ __( 'Download Button Settings' ) }>
 					<ToggleControl
 						label={ __( 'Show Download Button' ) }
-						help={ getDownloadButtonHelp }
 						checked={ showDownloadButton }
 						onChange={ changeShowDownloadButton }
 					/>