Fix duplicate text and improve grammar in authentication practices documentation

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Overview

This issue addresses duplicate content and grammatical improvements in the authentication practices documentation. The changes include removing a duplicate sentence in the principle of least privilege section and improving sentence flow in the password security section. These corrections eliminate redundancy and enhance readability without altering technical content.

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What needs to be done

• Remove duplicate sentence "Grant users the minimum permissions necessary to complete their work" that appears twice in the principle of least privilege section
• Improve grammar in password security section by changing "Require strong passwords that meet" to "by requiring strong passwords that meet" for better sentence flow
• Ensure all changes maintain consistent documentation style and technical accuracy
• Verify no other duplicate content exists in the surrounding sections

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Files to be changed

• doc/auth/auth_practices.md

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Labels

~"group::documentation" ~"technical writing" ~"size::1"