Fix subscribe docs formState link (#1195)

Co-authored-by: hiromieguchi802-lab <hiromieguchi802-lab@users.noreply.github.com>

Author: hiromieguchi802-lab

src/content/docs/useform/subscribe.mdx

@@ -6,7 +6,7 @@ sidebar: apiLinks
 
 ## `subscribe:` <TypeText>`UseFormSubscribe<TFieldValues extends FieldValues>`</TypeText>
 
-Subscribe to [`formState`](/docs/useform/formState) changes and value updates. You can subscribe to individual fields or the entire form, while avoiding unnecessary re-renders caused by form changes.
+Subscribe to [`formState`](/docs/useform/formstate) changes and value updates. You can subscribe to individual fields or the entire form, while avoiding unnecessary re-renders caused by form changes.
 
 ### Props