Forward ref in 4.1 to 4.1.7-10 ?

[azaroth42]

In the intro of 4.1 there is quite some time spent describing the last-in wins approach to contexts. In 1.1 this is no longer the whole picture, with the addition of @import, @propagate, scoped contexts and @protected

Propose a forward reference at the end of the text after example 20 to these sections.