update host desc that a host can be defined using more than one vs

[idouba]

the traffic properties of a host can be defined using more than one VirtualService
istio/istio#12590

[istio-testing]

Hi @idouba. 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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[linsun]

Thanks, LG to me. Defer to @frankbu @rshriram to approve this.

[frankbu]

Thanks @idouba, but this needs to be sent to the release-1.1 branch, so we can get it into the 1.1 docs.

[andraxylia]

/lgtm
/approve

[istio-testing]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andraxylia, idouba

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[idouba]

@frankbu release 1.1 pls refer to #873