Add required steps for installing enterprise on Openshift v4.16+ on AWS

[vara2504]

Updating enterprise doc similar to this OSS change - #1820

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[vara2504]

@ctauchen Do we have the version doc for 3.21 enterprise, we need this change to be part of v3.21 enterprise docs too

[radTuti]

otherwise LGTM

[radTuti]

i don't think this change is needed here as this does are not user facing anymore, right @ctauchen ?