Nit: fix invalid yaml syntax (#458)

Author: devalog

fern/products/docs/pages/seo/redirects.mdx

@@ -14,8 +14,8 @@ The `redirects` object allows you to redirect traffic from one path to another.
       # Exact path redirects
       - source: "/old-path"
         destination: "/new-path"
-- source: "/old-folder/path"
-destination: "/new-folder/path"
+      - source: "/old-folder/path"
+        destination: "/new-folder/path"
 
       # Regex-based redirects  
       - source: "/old-folder/:slug" # <- /old-folder/foo, /old-folder/bar, etc.