chore(style-guide): update anchor (#3147)

Correct anchor link to "Application structure and Angular modules".

Author: pcoucke

public/docs/ts/latest/guide/style-guide.jade

@@ -51,7 +51,7 @@ a(id='toc')
     1. [Single responsibility](#single-responsibility)
     1. [Naming](#naming)
     1. [Coding conventions](#coding-conventions)
-    1. [App structure and Angular modules](#app-structure-and-angular-modules)
+    1. [App structure and Angular modules](#application-structure-and-angular-modules)
     1. [Components](#components)
     1. [Directives](#directives)
     1. [Services](#services)