Update configure-authentication.md

[dereklangMSFT]

Removed confusing language regarding EHTTP vs. HTTPS management points and how client authentication is handled.

EHTTP does not use client auth certs from internal CA's

[prmerger-automator[bot]]

@dereklangMSFT : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod[bot]]

Learn Build status updates of commit f945170:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
memdocs/configmgr/core/clients/manage/cmg/configure-authentication.md	:white_check_mark: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

[BalaDelli]

#sign-off

[prmerger-automator[bot]]

@dereklangMSFT : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.