Title: Fix duplicate text and improve grammar in authentication practices documentation

Mithradevi Krequested to merge
gitlab-community/gitlab-org/gitlab:Mithradevi_Kumar-master-patch-19453 into master

Description

This MR fixes duplicate content and improves grammar in the authentication practices documentation. It removes a duplicate sentence in the principle of least privilege section and improves sentence flow in the password security section by changing the construction to a participial phrase. No technical content was removed—only duplicate text was eliminated and grammar was enhanced for better readability.

Files Changed

  • doc/auth/auth_practices.md

Related Issue

Closes #575028

Edited by Mithradevi K

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