Add documentation for proxy-cookie-domain annotation (#2034)

[jstoja]

Documentation for proxy-cookie-domain annotation was missing.
This fixes #2034 and solves the answers of @aledbf .

[jstoja]

/assign @aledbf

[aledbf]

/lgtm
/approve

[aledbf]

@jstoja thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[codecov-io]

Codecov Report

Merging #2666 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2666   +/-   ##
=======================================
  Coverage   40.84%   40.84%           
=======================================
  Files          72       72           
  Lines        5073     5073           
=======================================
  Hits         2072     2072           
  Misses       2718     2718           
  Partials      283      283

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