add docs

docs/designers-developers/developers/block-api/block-registration.md

@@ -236,6 +236,7 @@ variations: [
 		title: __( 'Twitter' ),
 		icon: TwitterIcon,
 		attributes: { service: 'twitter' },
+		keywords: [ __('tweet') ],
 	},
 ],
 ```
@@ -245,12 +246,13 @@ An object describing a variation defined for the block type can contain the foll
 - `name` (type `string`) – The unique and machine-readable name.
 - `title` (type `string`) – A human-readable variation title.
 - `description` (optional, type `string`) – A detailed variation description.
-- `icon` (optional, type `String` | `Object`) – An icon helping to visualize the variation. It can have the same shape as the block type.
+- `icon` (optional, type `string` | `Object`) – An icon helping to visualize the variation. It can have the same shape as the block type.
 - `isDefault` (optional, type `boolean`) – Indicates whether the current variation is the default one. Defaults to `false`.
 - `attributes` (optional, type `Object`) – Values that override block attributes.
 - `innerBlocks` (optional, type `Array[]`) – Initial configuration of nested blocks.
 - `example` (optional, type `Object`) – Example provides structured data for the block preview. You can set to `undefined` to disable the preview shown for the block type.
-- `scope` (optional, type `String[]`) - the list of scopes where the variation is applicable. When not provided, it assumes all available scopes. Available options: `block`, `inserter`.
+- `scope` (optional, type `string[]`) - the list of scopes where the variation is applicable. When not provided, it assumes all available scopes. Available options: `block`, `inserter`.
+- `keywords` (optional, type `string[]`) - An array of terms (which can be translated) that help users discover the variation while searching.
 
 It's also possible to override the default block style variation using the `className` attribute when defining block variations.