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由 Josh Justice 提交于
Guide generation is configured to detect a guide header by a 40-or-more-hyphen long line. The Action Cable guide was missing this line, so the page title on the guides site was only showing "Ruby on Rails Guides", and the section title in the Kindle index was "Ruby on Rails Guides". Adding the header demarcation line back in fixes both of these. Fixes #25697 [ci skip]
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