fix test typos ✅

Author: jaffrepaul

docs/contributing/pages/variables.mdx

@@ -4,7 +4,7 @@ noindex: true
 sidebar_order: 50
 ---
 
-A transformaton is exposd to both Markdown and MDX files which supports processing variables in a Django/Jekyll-style way.
+A transformation is exposed to both Markdown and MDX files which supports processing variables in a Django/Jekyll-style way.
 The variables available are globally scoped and configured within `remark-variables.js`.
 
 For example: