Restore missing link in CodeOfConduct.rst (llvm#106385)

Link restored from the original policy outlined here
https://discourse.llvm.org/t/code-of-conduct-changes-related-to-llvm-project-policy-changes/64197

Author: cor3ntin

llvm/docs/CodeOfConduct.rst

@@ -197,7 +197,7 @@ Unported License`_.
 
 .. _Django Project: https://www.djangoproject.com/conduct/
 .. _Speak Up! project: http://speakup.io/coc.html
-.. _sexual and gender-based violence:
+.. _sexual and gender-based violence: https://hr.un.org/sites/hr.un.org/files/SEA%20Glossary%20%20%5BSecond%20Edition%20-%202017%5D%20-%20English_0.pdf
 .. _hate crimes: https://hatecrime.osce.org
 .. _hate speech: https://www.un.org/en/genocideprevention/documents/UN%20Strategy%20and%20Plan%20of%20Action%20on%20Hate%20Speech%2018%20June%20SYNOPSIS.pdf
 .. _Creative Commons Attribution 3.0 Unported License: http://creativecommons.org/licenses/by/3.0/