fix SAF resource provider doc

[taban03]

Describe your pull request here: Add details of the three different SAF resource rproviders

List the file(s) included in this PR: api-mediation/configuration-saf-resource-checking.md

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[github-actions]

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[github-actions]

🚀 Deployed on https://677fa31593ef4f463e65dbae--zowe-docs-master.netlify.app

[janan07]

Doc squad review