「Fetch APIによるデータの送信」の節のArray#filterメソッドの説明のタイポを修正 (#912)

Author: chvmvd

docs/3-web-servers/07-fetch-api-post/index.mdx

@@ -212,7 +212,7 @@ document.getElementById("search-button").onclick = async () => {
 ```javascript
 const numbers = [1, 2, 3, 4, 5, 6, 7, 8];
 
-/// [2, 4, 6, 8]
+// [2, 4, 6, 8]
 const evenNumbers = numbers.filter((number) => number % 2 === 0);
 ```