Update doc for Lint/FlipFlop

This PR updates doc for `Lint/FlipFlop` based on the change to flip-flop in Ruby 2.7.
rubocop · Oct 26, 2020 · d5b2229 · d5b2229
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diff --git a/docs/modules/ROOT/pages/cops_lint.adoc b/docs/modules/ROOT/pages/cops_lint.adoc
@@ -1534,8 +1534,14 @@ end
 | -
 |===
 
-This cop looks for uses of flip-flop operator.
-flip-flop operator is deprecated since Ruby 2.6.0.
+This cop looks for uses of flip-flop operator
+based on the Ruby Style Guide.
+
+Here is the history of flip-flops in Ruby.
+flip-flop operator is deprecated in Ruby 2.6.0 and
+the deprecation has been reverted by Ruby 2.7.0 and
+backported to Ruby 2.6.
+See: https://bugs.ruby-lang.org/issues/5400
 
 === Examples
 

diff --git a/lib/rubocop/cop/lint/flip_flop.rb b/lib/rubocop/cop/lint/flip_flop.rb
@@ -3,8 +3,14 @@
 module RuboCop
   module Cop
     module Lint
-      # This cop looks for uses of flip-flop operator.
-      # flip-flop operator is deprecated since Ruby 2.6.0.
+      # This cop looks for uses of flip-flop operator
+      # based on the Ruby Style Guide.
+      #
+      # Here is the history of flip-flops in Ruby.
+      # flip-flop operator is deprecated in Ruby 2.6.0 and
+      # the deprecation has been reverted by Ruby 2.7.0 and
+      # backported to Ruby 2.6.
+      # See: https://bugs.ruby-lang.org/issues/5400
       #
       # @example
       #   # bad