Fix example format warning

Author: ksss

lib/rubocop/cop/yard/meaningless_tag.rb

@@ -3,7 +3,7 @@
 module RuboCop
   module Cop
     module YARD
-      # @example
+      # @example meaningless tag
       #   # bad
       #   # @param [String] foo
       #   # @option bar baz [String]

lib/rubocop/cop/yard/mismatch_name.rb

@@ -3,7 +3,7 @@
 module RuboCop
   module Cop
     module YARD
-      # @example
+      # @example mismatch name
       #   # bad
       #   # @param [void] baz
       #   # @option opt aaa [void]

lib/rubocop/cop/yard/tag_type.rb

@@ -3,7 +3,7 @@
 module RuboCop
   module Cop
     module YARD
-      # @example
+      # @example tag type
       #   # bad
       #   # @param [Integer String]
       #