chore: fix typo for enterprise readme

apps/emqx_enterprise/README.md

@@ -1,6 +1,5 @@
 # EMQX Enterprise Application
 
-This application so fart only holds EMQX config schema for enterprise edition.
+This application only holds EMQX config schema for enterprise edition so far.
 In the future this application will collect more responsibilities in managing
 enterprise edition specific features.
-