Fix typos in sidecar.proto

[howardjohn]

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[istio-testing]

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[istio-testing]

Hi @howardjohn. 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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[geeknoid]

Could you also make this change in the 1.1 branch (assuming the same text is there)?

Thanks.

[geeknoid]

You need to run "make" before submitting the PR so that the (unforutnately) checked in generated files are correctly updated. Doing so will fix the CI failures.

[howardjohn]

Sure, here is the PR for 1.1 #796