Rewrote some sections on authentication regarding automation

[DMoenks]

Fixes #9874

[ghost]

All CLA requirements met.

[opbld31]

Docs Build status updates of commit 48ac346:

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exchange/docs-conceptual/basic-auth-connect-to-exo-powershell.md	✅Succeeded	View (exchange-ps)

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[opbld32]

Docs Build status updates of commit 63c3d07:

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exchange/docs-conceptual/app-only-auth-powershell-v2.md	✅Succeeded	View (exchange-ps)
exchange/docs-conceptual/basic-auth-connect-to-exo-powershell.md	✅Succeeded	View (exchange-ps)

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[opbld33]

Docs Build status updates of commit bb484b1:

✅ Validation status: passed

File	Status	Preview URL	Details
exchange/docs-conceptual/app-only-auth-powershell-v2.md	✅Succeeded	View (exchange-ps)
exchange/docs-conceptual/basic-auth-connect-to-exo-powershell.md	✅Succeeded	View (exchange-ps)

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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