Sync svelte docs (#908)

sync svelte docs

Co-authored-by: Rich-Harris <1162160+Rich-Harris@users.noreply.github.com>

Author: github-actions[bot]

apps/svelte.dev/content/docs/svelte/03-template-syntax/03-each.md

@@ -74,6 +74,30 @@ You can freely use destructuring and rest patterns in each blocks.
 {/each}
 ```
 
+## Each blocks without an item
+
+```svelte
+<!--- copy: false  --->
+{#each expression}...{/each}
+```
+
+```svelte
+<!--- copy: false  --->
+{#each expression, index}...{/each}
+```
+
+In case you just want to render something `n` times, you can omit the `as` part ([demo](/playground/untitled#H4sIAAAAAAAAE3WR0W7CMAxFf8XKNAk0WsSeUEaRpn3Guoc0MbQiJFHiMlDVf18SOrZJ48259_jaVgZmxBEZZ28thgCNFV6xBdt1GgPj7wOji0t2EqI-wa_OleGEmpLWiID_6dIaQkMxhm1UdwKpRQhVzWSaVORJNdvWpqbhAYVsYQCNZk8thzWMC_DCHMZk3wPSThNQ088I3mghD9UwSwHwlLE5PMIzVFUFq3G7WUZ2OyUvU3JOuZU332wCXTRmtPy1NgzXZtUFp8WFw9536uWqpbIgPEaDsJBW90cTOHh0KGi2XsBq5-cT6-3nPauxXqHnsHJnCFZ3CvJVkyuCQ0mFF9TZyCQ162WGvteLKfG197Y3iv_pz_fmS68Hxt8iPBPj5HscP8YvCNX7uhYCAAA=)):
+
+```svelte
+<div class="chess-board">
+	{#each { length: 8 }, rank}
+		{#each { length: 8 }, file}
+			<div class:black={(rank + file) % 2 === 1}></div>
+		{/each}
+	{/each}
+</div>
+```
+
 ## Else blocks
 
 ```svelte

apps/svelte.dev/content/docs/svelte/98-reference/21-svelte-compiler.md

@@ -475,7 +475,8 @@ namespace AST {
 	export interface EachBlock extends BaseNode {
 		type: 'EachBlock';
 		expression: Expression;
-		context: Pattern;
+		/** The `entry` in `{#each item as entry}`. `null` if `as` part is omitted */
+		context: Pattern | null;
 		body: Fragment;
 		fallback?: Fragment;
 		index?: string;