DOC-1928: Fix typography options level offset

Author: Farzad Hayatbakhsh

modules/ROOT/pages/advanced-typography.adoc

@@ -85,7 +85,7 @@ tinymce.init({
 
 The following configuration options affect the behavior of the {pluginname} plugin.
 
-include::partial$configuration/advanced-typography.adoc[]
+include::partial$configuration/advanced-typography.adoc[leveloffset=+1]
 
 include::partial$misc/plugin-toolbar-button-id-boilerplate.adoc[]