Fix the Content Editor strikethrough shortcut docs
What does this MR do and why?
If I understand correctly, GitLab's Content Editor uses Tiptap, and its default keyboard shortcut for strikethrough is mod+shift+x. From my testing, the Content Editor currently uses that shortcut.
But doc/user/shortcuts.md
says it's mod+shift+s ("s" rather than "x"). This MR corrects that.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by Steve Mokris