docs(search): set minimum length to 2
docs(search): set minimum length to 2

With the minimum search length set to 3, it was not possible to search for `$q`.
Changing this to 2 fixes that without really upsetting the search display, since we
only display the first 40 API and 14 non-API items anyway.

Closes #3078

ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js,ggershoni/angular.js