docs(examples): add `fn` example

examples/lua/keymaps-supress-exit.lua

@@ -22,7 +22,7 @@ local fooModeKeymaps =
 	y = function(self)
 		self:switch('Bar', barModeKeymaps) -- enters Bar and then exits Foo when it is done
 	end,
-	z = libmodal.mode.switch('Bar', barModeKeymaps), -- the same as above, but more convenience
+	z = libmodal.mode.map.switch('Bar', barModeKeymaps), -- the same as above, but more convenience
 }
 
 -- tell the mode not to exit automatically

examples/lua/keymaps.lua

@@ -24,7 +24,9 @@ local fooModeKeymaps =
 	o = 'norm o',
 	p = 'bp',
 
-	zf = 'split',
+	x = libmodal.mode.map.fn(vim.notify, 'hello'),
+
+	zf = libmodal.mode.map.fn(vim.cmd.split),
 	zfc = 'q',
 	zff = split_twice,
 	zfo = 'vsplit',