docs(product-overview): update author name presentation

Change author name from 'Yukun Yu' to 'Kun Yu' in the product overview introduction.

Co-Authored-By: Hagicode <noreply@hagicode.com>
Signed-off-by: newbe36524 <newbe36524@qq.com>

Author: newbe36524

src/content/docs/en/product-overview.mdx

@@ -8,7 +8,7 @@ import LiveBroadcastCard from '@/components/LiveBroadcastCard.astro';
 import ProductHuntBadge from '@/components/ProductHuntBadge.astro';
 import ProductVideoShowcase from '@/components/ProductVideoShowcase.astro';
 
-Hello, fellow creators. I'm Yukun Yu, the creator of **HagiCode**.
+Hello, fellow creators. I'm Kun Yu, the creator of **HagiCode**.
 
 On this page, I want to explain more directly what I am actually trying to build with HagiCode.