Update comment about the toggle inlay hints keymap

This comment was added in 5540527fab, but
it was referring to an autocommand, despite the relevant code creating a
keymap, not an autocommand.

init.lua

@@ -533,7 +533,7 @@ require('lazy').setup({
             })
           end
 
-          -- The following autocommand is used to enable inlay hints in your
+          -- The following code creates a keymap to toggle inlay hints in your
           -- code, if the language server you are using supports them
           --
           -- This may be unwanted, since they displace some of your code