Fixed a few typos in en-us.yaml

[simonflood]

Summary

Spotted a couple of typos in Harvester then found more when I checked source

PR Checklist

• Is this a multi-tenancy feature/bug?
  • [ ] Yes, the relevant RBAC changes are at:
• Do we need to backport changes to the old Rancher UI, such as RKE1?
  • [ ] Yes, the relevant PR is at:
• Are backend engineers aware of UI changes?
  • [ ] Yes, the backend owner is:

Fixes #

Fixed typos in UI

Occurred changes and/or fixed issues

Various typos in UI

Technical notes summary

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video