config.lua(8): catch up to recently added hooks

While we're here, let's stylize these as functions instead of just raw text.
A future change may allow arbitrary data arguments to be passed some of
these, and the distinction is useful.

stand/lua/config.lua.8

@@ -180,8 +180,10 @@ commands.
 The following hooks are defined in
 .Nm :
 .Bl -tag -width "config.reloaded" -offset indent
-.It config.loaded
-.It config.reloaded
+.It Fn config.loaded
+.It Fn config.reloaded
+.It Fn kernel.loaded
+.It Fn modules.loaded
 .El
 .Sh SEE ALSO
 .Xr loader.conf 5 ,