Fixed typo on guides.md

guides.md

@@ -9,6 +9,6 @@ These guides walk you through ways of using CommunityRule.
 * [Create your first rule]({% link _guides/first_rule.md %})
 * [Publish a Rule on CommunityRule]({% link _guides/publish_rule.md %})
 * [Add a Rule to a software project's Git repository]({% link _guides/git_repo.md %})
-* [Rules for Mutual Aid Groups]({ link _guides/mutual_aid.md %})
+* [Rules for Mutual Aid Groups]({% link _guides/mutual_aid.md %})
 
-Want a guide on another topic? Let us know!
+Want a guide on another topic? Let us know.