Update self-assessment.md

Signed-off-by: Dhanraj Chavan dc6707914@gmail.com
Co-authored-by: Raiya Haque raiya811@gmail.com
Co-authored-by: Abdul Alhazmi Aa11533@nyu.edu
Co-authored-by: Sushanth Ravipalli sushanth3120@gmail.com

@raiyahaque @abkzmii @sushanth3120

assessments/projects/cortex/self-assessment.md

@@ -27,6 +27,7 @@ Express Learning course provided by Linux Foundation Training & Certification:
 * [Secure development practices](#secure-development-practices)
 * [Security issue resolution](#security-issue-resolution)
 * [Appendix](#appendix)
+* [Action Items](#action-items)
 
 ## Metadata