fix syntax in template

post_template.md

@@ -5,8 +5,7 @@ draft: false
 summary: "{{ frontmatter.summary }}"
 author: "{{ frontmatter.author }}"
 original_link: "{{ frontmatter.original_link }}"
-categories: ["network, {{ frontmatter.feed_name}}"]
+categories: ["network", "{{ frontmatter.feed_name}}"]
-
 ---
 
 {{ content }}