chore(types): add tsdocs

packages/svelte/src/lib/types/edges.ts

@@ -11,7 +11,9 @@ import type {
 import type { Node } from '$lib/types';
 
 /**
- * The Edge type is mainly used for the `edges` that get passed to the SvelteFlow component.
+ * An `Edge` is the complete description with everything React Flow needs
+ *to know in order to render it.
+ * @public
  */
 export type Edge<
   EdgeData extends Record<string, unknown> = Record<string, unknown>,