Update online keyboard shortcuts help

Make it a bit more compact by merging a few one/the other entries,
make labels read better.
5 jobs for wip/fix-main-window-shortcuts in 23 minutes and 47 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #504926
fedora

00:04:06

passed #504927
ubuntu

00:12:53

 
  Test
passed #504928
flatpak

00:09:43

 
  Deploy
passed #504929
review

00:00:33

passed #504930
allowed to fail manual
stop_review

00:00:36