Better description for embed blocks (WordPress#6124)

* Better description for embed blocksn

* update description

* Check based on description

* Blocks: Add a period to the description of embed

blocks/library/embed/index.js

@@ -26,18 +26,13 @@ import BlockAlignmentToolbar from '../../block-alignment-toolbar';
 // These embeds do not work in sandboxes
 const HOSTS_NO_PREVIEWS = [ 'facebook.com' ];
 
-function getEmbedBlockSettings( { title, icon, category = 'embed', transforms, keywords = [] } ) {
+function getEmbedBlockSettings( { title, description, icon, category = 'embed', transforms, keywords = [] } ) {
 	return {
 		title,
-
-		description: __( 'The Embed block allows you to easily add videos, images, tweets, audio, and other content to your post or page.' ),
-
+		description: description || __( `Paste URLs from ${ title } to embed the content in this block.` ),
 		icon,
-
 		category,
-
 		keywords,
-
 		attributes: {
 			url: {
 				type: 'string',
@@ -266,6 +261,7 @@ export const name = 'core/embed';
 
 export const settings = getEmbedBlockSettings( {
 	title: __( 'Embed' ),
+	description: __( 'The Embed block allows you to easily add videos, images, tweets, audio, and other content to your post or page.' ),
 	icon: 'embed-generic',
 	transforms: {
 		from: [