minor #1177 added missing space (OskarStark)
minor #1177 added missing space (OskarStark)

This PR was merged into the 6.2-dev branch.

Discussion
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added missing space

<!-- Please fill in this template according to the PR you're about to submit. -->

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Doc update?   | yes
| BC breaks?    | no
| Deprecations? | no
| Fixed tickets | #... <!-- #-prefixed issue number(s), if any -->
| License       | MIT

<!-- Replace this comment by the description of your issue. -->

Commits
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bd8223e added missing space

swiftmailer/swiftmailer,michabbb-backup/swiftmailer,michabbb-backup/swiftmailer,swiftmailer/swiftmailer