OSDOCS typo and removes SDN modules in main-4.17

[JoeAldinger]

This PR removes the SDN modules from main and will go back to 4.17 where SDN was removed. It also fixes a typo.

Version(s):
4.17+

Issue:
https://issues.redhat.com/browse/OSDOCS-13364

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Mon Nov 03 14:20:28 - Prow CI generated the docs preview:

https://101368--ocpdocs-pr.netlify.app/
https://101368--ocpdocs-pr.netlify.app/openshift-enterprise/latest/networking/network_security/egress_firewall/configuring-egress-firewall-ovn.html

[openshift-ci]

@JoeAldinger: all tests passed!

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[JoeAldinger]

/cherrypick enteprise-4.21

[JoeAldinger]

/cherrypick enterprise-4.20

[openshift-cherrypick-robot]

@JoeAldinger: cannot checkout enteprise-4.21: error checking out "enteprise-4.21": exit status 1 error: pathspec 'enteprise-4.21' did not match any file(s) known to git

In response to this:

/cherrypick enteprise-4.21

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[JoeAldinger]

/cherrypick enterprise-4.19

[JoeAldinger]

/cherrypick enterprise-4.21

[openshift-cherrypick-robot]

@JoeAldinger: new pull request created: #101640

In response to this:

/cherrypick enterprise-4.20

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[JoeAldinger]

/cherrypick enterprise-4.18

[JoeAldinger]

/cherrypick enterprise-4.17

[openshift-cherrypick-robot]

@JoeAldinger: new pull request created: #101641

In response to this:

/cherrypick enterprise-4.19

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[openshift-cherrypick-robot]

@JoeAldinger: new pull request created: #101642

In response to this:

/cherrypick enterprise-4.21

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[openshift-cherrypick-robot]

@JoeAldinger: new pull request created: #101643

In response to this:

/cherrypick enterprise-4.18

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[openshift-cherrypick-robot]

@JoeAldinger: new pull request created: #101644

In response to this:

/cherrypick enterprise-4.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[JoeAldinger]

/cherrypick enterprise-4.17

[openshift-cherrypick-robot]

@JoeAldinger: new pull request could not be created: failed to create pull request against openshift/openshift-docs#enterprise-4.17 from head openshift-cherrypick-robot:cherry-pick-101368-to-enterprise-4.17: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for openshift-cherrypick-robot:cherry-pick-101368-to-enterprise-4.17."}],"documentation_url":"https://docs.github.com/rest/pulls/pulls#create-a-pull-request","status":"422"}

In response to this:

/cherrypick enterprise-4.17

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.