[release-1.3] fix link issue

[istio-testing]

This is an automated cherry-pick of #5115

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[istio-testing]

@istio-testing: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
lint_istio.io_release-1.3	30157dc	link	/test lint_istio.io_release-1.3

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[geeknoid]

@linsun There remains a lint error in release-1.3. 1.3.x needs to be added to .spelling in the 1.3 branch.

[frankbu]

@geeknoid @linsun, the other lint error was fixed in a separate PR. I force merged this cherry-pick because I knew it's there.

[linsun]

Thanks @frankbu - yes I can also confirm that lint error was fixed in .3 branch earlier @geeknoid