fix small typo in README.md

[AObuchow]

What does this PR do?

Fixes a small typo in the recently updated README.md

What issues does this PR fix or reference?

Follow-up of #1334

Is it tested? How?

n/a, docs change

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AObuchow, dkwon17

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