update or add wording indicating the use of :type tagging and our preference for it over inferring location

Author: JonRowe

features/controller_specs/README.md

@@ -1,5 +1,5 @@
-Controller specs live in `spec/controllers` or any example group with
-`:type => :controller`.
+Controller specs are marked by `:type => :controller` or if you have set
+`config.infer_spec_type_from_file_location!` by placing them in `spec/controllers`.
 
 A controller spec is an RSpec wrapper for a Rails functional test
 ([ActionController::TestCase::Behavior](https://github.com/rails/rails/blob/master/actionpack/lib/action_controller/test_case.rb)).

features/helper_specs/helper_spec.feature

@@ -1,7 +1,7 @@
 Feature: helper spec
 
-  Helper specs live in `spec/helpers`, or any example group with `:type =>
-  :helper`.
+  Helper specs are marked by `:type => :helper` or if you have set
+  `config.infer_spec_type_from_file_location!` by placing them in `spec/helpers`.
 
   Helper specs expose a `helper` object, which includes the helper module being
   specified, the `ApplicationHelper` module (if there is one) and all of the

features/mailer_specs/url_helpers.feature

@@ -1,5 +1,8 @@
 Feature: URL helpers in mailer examples
 
+  Mailer specs are marked by `:type => :mailer` or if you have set
+  `config.infer_spec_type_from_file_location!` by placing them in `spec/mailer`.
+
   Scenario: using URL helpers with default options
     Given a file named "config/initializers/mailer_defaults.rb" with:
       """ruby

features/model_specs/README.md

@@ -1,5 +1,5 @@
-Model specs live in `spec/models` or any example group with
-`:type => :model`.
+Model specs are marked by `:type => :model` or if you have set
+`config.infer_spec_type_from_file_location!` by placing them in `spec/models`.
 
 A model spec is a thin wrapper for an ActiveSupport::TestCase, and includes all
 of the behavior and assertions that it provides, in addition to RSpec's own

features/routing_specs/README.md

@@ -1,5 +1,5 @@
-Routing specs live in the `spec/routing` directory, or any example group with
-`:type => :routing`.
+Routing specs are marked by `:type => :routing` or if you have set
+`config.infer_spec_type_from_file_location!` by placing them in `spec/routing`.
 
 Simple apps with nothing but standard RESTful routes won't get much value from
 routing specs, but they can provide significant value when used to specify