Update pod affinity/anti affinity doc to not include Gt and Lt operators.

[aveshagarwal]

This is a...

• [ x] Bug Report

Problem:
The doc https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity incorrectly specifies that "As with node affinity, the legal operators for pod affinity and anti-affinity are In, NotIn, Exists, DoesNotExist, Gt, Lt." As pod affinity/anti-affinity only works with regular label selectors: In, NotIn, Exists, DoesNotExist.

Proposed Solution:
Specify clearly that Gt and Lt does not work with pod affinit/anti-affinity

Page to Update:
https://kubernetes.io/docs/concepts/configuration/assign-pod-node/#affinity-and-anti-affinity

[aveshagarwal]

@kubernetes/sig-scheduling-bugs

[aveshagarwal]

I will send a PR soon to address this unless someone else wants to help.

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