other small typos

mainly from comment by Remus< https://linuxfr.org/news/openjdk-jep-180-hashmap-collisions-attaques-par-la-complexite#comment-1536688
other typos from the thread by claudex< https://linuxfr.org/users/cykl/journaux/openjdk-jep-180-hashmap-collisions-attaques-par-la-complexite#comment-1536338