[ZEPPELIN-6489] Fix stale Shiro authentication documentation links

[xhaktm00]

What is this PR for?

The Shiro authentication docs URL referenced in conf/shiro.ini.template and in the Kerberos/Knox authentication filter error messages no longer resolves. The stale link has three defects: it uses http:// instead of https:// (template only), the path is missing the setup/ segment, and the file name is missing an underscore (shiroauthentication.html → shiro_authentication.html).

This PR updates all three pointers to the current docs address, which is published from docs/setup/security/shiro_authentication.md:

https://zeppelin.apache.org/docs/latest/setup/security/shiro_authentication.html

The surrounding comment/message text is unchanged. One line in KnoxAuthenticationFilter is re-wrapped to keep the longer URL within the 100-character checkstyle limit.

What type of PR is it?

Documentation

Todos

• Update the stale URL in conf/shiro.ini.template, KerberosAuthenticationFilter and KnoxAuthenticationFilter

What is the Jira issue?

• ZEPPELIN-6489

How should this be tested?

No code behavior changes — the URLs appear only in a config template comment and log messages, so no unit tests are added.

• Confirm the source page exists at docs/setup/security/shiro_authentication.md
• Confirm no stale variants remain:

  rg -n "shiroauthentication|docs/latest/security/shiro|http://zeppelin.apache.org/docs/latest/security" conf zeppelin-server
  

• Open https://zeppelin.apache.org/docs/latest/setup/security/shiro_authentication.html and confirm it loads (verified: HTTP 200)

Screenshots (if appropriate)

N/A

Questions:

• Does the license files need to update? No
• Is there breaking changes for older versions? No
• Does this needs documentation? No

[Copilot]

Pull request overview

This PR updates stale Apache Zeppelin Shiro authentication documentation links referenced in a config template and in Kerberos/Knox authentication filter log messages, aligning them with the current published docs path under docs/latest/setup/security/.

Changes:

• Update conf/shiro.ini.template comment to use the correct https:// URL and updated docs path/filename.
• Update Kerberos filter error message link to the current Shiro authentication docs URL and preserve the #kerberos-auth anchor.
• Re-wrap the Knox filter error message URL across lines to keep within checkstyle line-length constraints while updating the link target.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
conf/shiro.ini.template	Fixes the Shiro auth documentation link in the Active Directory realm configuration comment.
zeppelin-server/src/main/java/org/apache/zeppelin/realm/kerberos/KerberosAuthenticationFilter.java	Updates the KerberosRealm misconfiguration error message to point to the correct Shiro auth docs URL.
zeppelin-server/src/main/java/org/apache/zeppelin/realm/jwt/KnoxAuthenticationFilter.java	Updates the KnoxJwtRealm misconfiguration error message URL and re-wraps it to satisfy line-length rules.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[jongyoul]

The Kerberos link still uses #kerberos-auth, but the published page has the heading HTTP SPNEGO Authentication. The site runs AnchorJS over that heading, producing #http-spnego-authentication, so the current fragment does not navigate to the Kerberos section. Please update the fragment to #http-spnego-authentication and re-check the complete URL.

[xhaktm00]

@jongyoul Thank you for pointing this out. The page generates heading ids at runtime via AnchorJS, which I missed when checking the static HTML. I updated the Kerberos fragment to #http-spnego-authentication and verified both fragments against the AnchorJS urlify logic (Knox SSO → #knox-sso was already correct).