Fix a typo (a -> an in front of additional)

[Wertzui123]

see title.

[Wertzui123]

ah I forgot to add a prefix to the commit message

[Wertzui123]

How am I supposed to format it? The documentation doesn't seem to include a prefix for typo-fixes.

[provokateurin]

docs: Fix typo or something like that

[nickvergessen]

Since the other jobs will not turn green anyway because it's a fork, just remember it for the next time :)
Thanks for the quick fix! 🎉

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

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