[BUG] Typo in securityadmin.sh hint

[prabhask5]

Description

Fixed typo in "Try running securityadmin.sh with -icl (but no -cl) and -nhnv (If that works you need to check your clustername as well as hostnames in your TLS certificates)", changed -cl to -cn as per: #4376

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)
  Bug fix

• Why these changes are required?
  -cl does not exist, so it was changed to the correct -cn

• What is the old behavior before changes and new behavior after changes?
  Nothing ideally

Issues Resolved

#4376

Is this a backport? If so, please add backport PR # and/or commits #
No

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.18%. Comparing base (20c8775) to head (5695d51).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4526      +/-   ##
==========================================
- Coverage   65.22%   65.18%   -0.05%     
==========================================
  Files         313      313              
  Lines       22053    22053              
  Branches     3561     3561              
==========================================
- Hits        14385    14376       -9     
- Misses       5895     5903       +8     
- Partials     1773     1774       +1     

Files	Coverage Δ
...a/org/opensearch/security/tools/SecurityAdmin.java	44.39% <ø> (ø)

... and 4 files with indirect coverage changes