chore: add `@description` tags (#12063)

add them so that the TypeScript parser doesn't put the following content under the `@deprecated` tag, which messes with the JSON-type-generation script.

packages/svelte/src/index.d.ts

@@ -170,6 +170,7 @@ export class SvelteComponentTyped<
 /**
  * @deprecated The new `Component` type does not have a dedicated Events type. Use `ComponentProps` instead.
  *
+ * @description
  * Convenience type to get the events the given component expects. Example:
  * ```html
  * <script lang="ts">
@@ -208,6 +209,7 @@ export type ComponentProps<Comp extends SvelteComponent | Component<any>> =
 /**
  * @deprecated This type is obsolete when working with the new `Component` type.
  *
+ * @description
  * Convenience type to get the type of a Svelte component. Useful for example in combination with
  * dynamic components using `<svelte:component>`.
  *

packages/svelte/types/index.d.ts

@@ -167,6 +167,7 @@ declare module 'svelte' {
 	/**
 	 * @deprecated The new `Component` type does not have a dedicated Events type. Use `ComponentProps` instead.
 	 *
+	 * @description
 	 * Convenience type to get the events the given component expects. Example:
 	 * ```html
 	 * <script lang="ts">
@@ -205,6 +206,7 @@ declare module 'svelte' {
 	/**
 	 * @deprecated This type is obsolete when working with the new `Component` type.
 	 *
+	 * @description
 	 * Convenience type to get the type of a Svelte component. Useful for example in combination with
 	 * dynamic components using `<svelte:component>`.
 	 *