Add safety note for autocorrection in have_http_status cop

Author: ydah

docs/modules/ROOT/pages/cops_rspecrails.adoc

@@ -57,6 +57,12 @@ end
 
 Checks that tests use `have_http_status` instead of equality matchers.
 
+[#safety-rspecrailshavehttpstatus]
+=== Safety
+
+The autocorrection is marked as unsafe because
+`response.status` response is not always an HTTP response.
+
 [#examples-rspecrailshavehttpstatus]
 === Examples
 

lib/rubocop/cop/rspec_rails/have_http_status.rb

@@ -5,6 +5,10 @@ module Cop
     module RSpecRails
       # Checks that tests use `have_http_status` instead of equality matchers.
       #
+      # @safety
+      #   The autocorrection is marked as unsafe because
+      #   `response.status` response is not always an HTTP response.
+      #
       # @example ResponseMethods: ['response', 'last_response'] (default)
       #   # bad
       #   expect(response.status).to be(200)