Update self-assessment.md

Signed-off-by: Dhanraj Chavan <39642060+heydc7@users.noreply.github.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