[ZEPPELIN-6223] Improve grammar and clarity in SECURITY-README.md for Shiro authentication#4959

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ParkGyeongTae:ZEPPELIN-6223

Commits on Jul 9, 2025

[ZEPPELIN-6223] Improve grammar and clarity in SECURITY-README.md for Shiro authentication
ParkGyeongTae
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Commits on Jul 14, 2025

[ZEPPELIN-6223] Update security documentation to reflect user-facing authentication description
ParkGyeongTae
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