docs: update Subnet discovery with optional tag

[kreempuff]

Release 2.1.2 included changes that relaxed requirements on subnet tagging
with the cluster name.

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[codecov-commenter]

Codecov Report

Merging #1943 (51f1d2d) into main (8d7b991) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1943   +/-   ##
=======================================
  Coverage   48.95%   48.95%           
=======================================
  Files         122      122           
  Lines        6690     6690           
=======================================
  Hits         3275     3275           
  Misses       3132     3132           
  Partials      283      283           

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[kishorj]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kishorj, kreempuff

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[kreempuff]

Do I have to do anything to deploy the docs?