Remove outdated doc for Rails/ActionFilter

Follow up rubocop#74. RuboCop Rails doesn't support Rails 3 or lower.
koic · Jun 22, 2019 · de680ad · de680ad
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diff --git a/lib/rubocop/cop/rails/action_filter.rb b/lib/rubocop/cop/rails/action_filter.rb
@@ -8,9 +8,6 @@ module Rails
       # The cop is configurable and can enforce the use of the older
       # something_filter methods or the newer something_action methods.
       #
-      # If the TargetRailsVersion is set to less than 4.0, the cop will enforce
-      # the use of filter methods.
-      #
       # @example EnforcedStyle: action (default)
       #   # bad
       #   after_filter :do_stuff

diff --git a/manual/cops_rails.md b/manual/cops_rails.md
@@ -11,9 +11,6 @@ This cop enforces the consistent use of action filter methods.
 The cop is configurable and can enforce the use of the older
 something_filter methods or the newer something_action methods.
 
-If the TargetRailsVersion is set to less than 4.0, the cop will enforce
-the use of filter methods.
-
 ### Examples
 
 #### EnforcedStyle: action (default)