Cherry-pick #13651 to 7.4: Remove in_cluster
from Kuberentes configuration examples
#13688
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Cherry-pick of PR #13651 to 7.4 branch. Original message:
This configuration was removed by #13051.
This PR is clean up for any remaining references of this configuration filed.
Kudos to @jsoriano for bringing this up in #13473
cc: @odacremolbap, @exekias