Fix documentation for the fallback mail subject (#15223)

The documentation for the [fallback mail subject](d989247bb0/services/mailer/mail_issue.go (L14-L16)) was missing `{{}}` around `.Issue.Index`.
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David Crocker 2021-03-31 11:36:21 -04:00 committed by GitHub
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@ -130,7 +130,7 @@ did not include a subject part), Gitea's **internal default** will be used.
The internal default (fallback) subject is the equivalent of:
```sh
{{.SubjectPrefix}}[{{.Repo}}] {{.Issue.Title}} (#.Issue.Index)
{{.SubjectPrefix}}[{{.Repo}}] {{.Issue.Title}} (#{{.Issue.Index}})
```
For example: `Re: [mike/stuff] New color palette (#38)`