fix: update icon

Author: SWHL

mkdocs.yml

@@ -52,7 +52,7 @@ theme:
         name: 暗黑主题
 
   icon:
-    logo: material/format/text
+    logo: material/format-text
     previous: fontawesome/solid/angle-left
     next: fontawesome/solid/angle-right
     repo: fontawesome/brands/github