The page is a cfork (and also coatracking to boot).
I don't care under which title or transliteration the article resides, but clearly we do not need a Shahid article and a Istishhad one any more than we need a martyrdom article on top of martyr''.
One is the term for the act, the other the term for the person doing the act, but the topic is one and the same.  (𒁳)