Use which-key for spelling hints (#780)

lua/lv-which-key/init.lua

@@ -21,6 +21,7 @@ which_key.setup {
       z = true, -- bindings for folds, spelling and others prefixed with z
       g = true, -- bindings for prefixed with g
     },
+    spelling = {enabled = true, suggestions = 20}, -- use which-key for spelling hints
   },
   icons = {
     breadcrumb = "»", -- symbol used in the command line area that shows your active key combo