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This commit adds a documentation note explaining the importance of overriding equals() and hashCode() in custom UserDetails implementations. The default SessionRegistryImpl in Spring Security uses an in-memory ConcurrentMap<Object, Set<String>>, Map<String,SessionInformation> to associate principals with sessions. If a custom UserDetails class does not properly override equals() and hashCode(), user sessions may not be tracked or matched correctly. I believe this helps developers avoid subtle session management issues when implementing custom authentication logic. Signed-off-by: Gurunathan <129361658+Gurunathan16@users.noreply.github.com>