`kill-left-alnum-word` and `kill-alnum-word-left`

[Balthild]

In the document, there are edit:kill-alnum-word-left and edit:kill-alnum-word-right. However, they are actually kill-left-alnum-word and kill-right-alnum-word.

elvish/pkg/edit/buffer_builtins.go

Lines 54 to 55 in 7b7462f

 "kill-left-alnum-word":  makeKill(moveDotLeftAlnumWord), 
 "kill-right-alnum-word": makeKill(moveDotRightAlnumWord), 

[Qi Xiao]

Thanks for reporting!