KNOX-3320: Document logout flows in Knox

[smolnar82]

KNOX-3320 - Add KnoxSSO Logout Documentation

What changes were proposed in this pull request?

This PR adds a comprehensive documentation chapter for the KnoxSSO logout flow. Key additions include:

• Detailed explanation of the user-facing logout.jsp and its query parameters (originalUrl, globalLogout, returnToApp, autoGlobalLogout).
• Technical details for the programmatic KNOXSSOUT service (WebSSOutResource), including its role in server-side token revocation and session tracking.
• Clarification of the distinction between Local Application Logout (cle

How was this patch tested?

N/A

Integration Tests

N/A

UI changes

N/A

[github-actions]

Test Results

21 tests   21 ✅  1s ⏱️
 1 suites   0 💤
 1 files     0 ❌

Results for commit 15d8994.