Fix link error about key vault.

[chenrujun]

Fix link error about key vault.

Failed pipeline: https://dev.azure.com/azure-sdk/internal/_build/results?buildId=1007591&view=logs&j=b70e5e73-bbb6-5567-0939-8415943fadb9&t=aea0e0e1-1e00-5c1b-bba8-b2b238976da3&l=54

[chenrujun]

Hi, @saragluna , @vcolin7 , please help to review this PR.

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[samvaity]

Thanks @chenrujun !

[chenrujun]

/check-enforcer override