Update cache-how-to-zone-redundancy.md

[animeshdas11]

Standard tier doesn't support zone redundancy in azure cache for redis. The same information is mentioned in the feature comparison section in -https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-overview#feature-comparison

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[Court72]

@flang-msft

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[flang-msft]

@animeshdas11 - Thanks for the heads up. The good news is this feature was released recently and now Standard caches do support availability zones.
#please-close