Apply suggestions from code review

Author: dummdidumm

.changeset/wise-grapes-enjoy.md

@@ -2,4 +2,4 @@
 'svelte': minor
 ---
 
-feat: Add `uidPrefix` option in `render` function
+feat: Add `uidPrefix` option in `render`/`mount`/`hydrate` functions

packages/svelte/src/internal/client/types.d.ts

@@ -10,7 +10,7 @@ export type EventCallbackMap = Record<string, EventCallback | EventCallback[]>;
 // when the JS VM JITs the code.
 
 export type ComponentContext = {
-	/** uid */
+	/** used as prefix for $props.id */
 	uid?: string;
 	/** parent */
 	p: null | ComponentContext;