Typo in email connector documentation

[mesellings]

Fix the "to u user" typo in the documentation for all versions:

https://docs.camunda.io/docs/next/components/connectors/out-of-the-box-connectors/microsoft-o365-mail/

[mesellings]

@giorgionaps could you please take a look at this? (low priority, but for alpha 5) 🙏