Removed 'how to'

'How to' in included in the intro so doesn't need to be repeated

docs/editor_manual/intro.rst

@@ -8,6 +8,6 @@ This documentation will explain how to:
 -  navigate the main user interface of Wagtail
 -  create pages of all different types
 -  modify, save, publish and unpublish pages
--  how to set up users, and provide them with specific roles to create a publishing workflow
+-  set up users, and provide them with specific roles to create a publishing workflow
 -  upload, edit and include images and documents
 -  ... and more!