NO-JIRA: Clarifies CSRF protection note for Basic auth challenges

[devguyio]

Removes a redundant word for clarity of the security note regarding CSRF token requirements for Basic authentication challenges.

Version(s): 4.20

Link to docs preview:

QE review:

• QE has approved this change.

[openshift-ci-robot]

@devguyio: This pull request explicitly references no jira issue.

In response to this:

Removes a redundant word for clarity of the security note regarding CSRF token requirements for Basic authentication challenges.

Version(s): 4.20

Link to docs preview:

QE review:

• QE has approved this change.

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[ocpdocs-previewbot]

🤖 Wed Jun 18 08:10:38 - Prow CI generated the docs preview:

https://94939--ocpdocs-pr.netlify.app/openshift-dedicated/latest/authentication/understanding-authentication.html
https://94939--ocpdocs-pr.netlify.app/openshift-enterprise/latest/authentication/understanding-authentication.html
https://94939--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/authentication/understanding-authentication.html
https://94939--ocpdocs-pr.netlify.app/openshift-rosa/latest/authentication/understanding-authentication.html

[openshift-ci]

@devguyio: all tests passed!

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