d1b05a1e07293081f0387f2737ad4c4a466cbcee
The documentation for the [fallback mail subject](https://github.com/go-gitea/gitea/blob/d989247bb08d2b8eb144e7a0edeaedfc26d08175/services/mailer/mail_issue.go#L14-L16) was missing `{{}}` around `.Issue.Index`.
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