Fix topic name slug

Author: shaedrich

topics/unist/index.md

@@ -4,6 +4,6 @@ short_description: unist is a specification for syntax trees. It has a big ecosy
 topic: unist
 url: https://unifiedjs.com/
 github_url: https://github.com/syntax-tree/unist
-related: ast, cst, syntax tree
+related: ast, cst, syntax-tree
 ---
 unist is a specification for syntax trees. It has a big ecosystem of utilities in JavaScript for working with these trees. It’s implemented by several other specifications.