fix broken link in old blog post

Author: ryyppy

_blogposts/archive/bucklescript-8-1-new-syntax.mdx

@@ -22,7 +22,7 @@ We apologize for having kept this under wrap; syntax discussions have always bee
 
 **Here's what you need to know:**
 - The new syntax comes directly with your BuckleScript 8.1 installation. You won't have to install anything else. It does not depend on the old `refmt`.
-- There are a few differences in syntax, documented [here](/docs/reason-compiler/latest/new-bucklescript-syntax).
+- There are a few differences in syntax, documented [here](/docs/manual/v8.0.0/migrate-from-bucklescript-reason).
 - This is BuckleScript-only currently.
 - Our editor support is currently limited; we'd like to take this occasion to clean it up. In the meantime, if you upgrade your [VSCode](https://marketplace.visualstudio.com/items?itemName=jaredly.reason-vscode) or [Sublime Text](https://github.com/reasonml-editor/sublime-reason) plugin, you should get the proper highlighting.
 - We've made a refmt-to-new-syntax converter that we'll release later. We'd like you to test it on small bits of code for now; a wholesale conversion at this stage would be a bit too rushed.