Replace Erubis with Erubi in a part of guide [ci skip] #29817
Merged
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Summary
This PR is a small documentation change.
Since Rails 5.1, Erubis ERB handler has been deprecated and recommended for Erubi.
https://github.com/rails/rails/blob/v5.1.2/guides/source/5_1_release_notes.md#deprecations-1
This PR replaces Erubis with Erubi in a part of guide. Since Erubis will be removed in Rails 5.2, I decided to replace rather than adding Erubi to the list.