Update Best Practices Document

[JackStuart]

Generic clean-up of the documentation (typo's, whitespace fixes, new line fixes)

Remove references to the Files page as that no longer exists.

[learn-build-service-prod]

Learn Build status updates of commit 0f408e8:

✅ Validation status: passed

File	Status	Preview URL	Details
CloudAppSecurityDocs/best-practices.md	✅Succeeded

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[learn-build-service-prod]

Learn Build status updates of commit ba53516:

✅ Validation status: passed

File	Status	Preview URL	Details
CloudAppSecurityDocs/best-practices.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit cda6407:

✅ Validation status: passed

File	Status	Preview URL	Details
CloudAppSecurityDocs/best-practices.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 6e991cd:

✅ Validation status: passed

File	Status	Preview URL	Details
CloudAppSecurityDocs/best-practices.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel