GCE/GKE proxy mentioned for Azure

[dsalamancaMS]

GCE/GKE are part of Google cloud not azure, so the note "proxy protocol is not supported in GCE/GKE" does not apply for azure

What this PR does / why we need it:

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[dsalamancaMS]

Signed the CLA

[dsalamancaMS]

/assign @ElvinEfendi

[aledbf]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, dsalamancaMS

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[aledbf]

GCE/GKE are part of Google cloud not azure

Apologies for this terrible mistake in the docs.

[aledbf]

@dsalamancaMS thanks!

[aledbf]

Merging.

[codecov-io]

Codecov Report

Merging #2717 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2717   +/-   ##
=======================================
  Coverage   40.95%   40.95%           
=======================================
  Files          72       72           
  Lines        5084     5084           
=======================================
  Hits         2082     2082           
  Misses       2713     2713           
  Partials      289      289

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