Fix some spelling errors

[JoeWrightss]

Fix some spelling errors:

1. "overriden" to "overridden".
2. "assinged" to "assigned".

[istio-testing]

Hi @JoeWrightss. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[JoeWrightss]

/assign @kyessenov

[JoeWrightss]

I submits this PR against release-1.1 now, Thank you for guiding me🙂.

[hzxuzhonghu]

/ok-to-test

[ozevren]

/lgtm
/approve

[istio-testing]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JoeWrightss, ozevren

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