fix: bug in lua.lua example file kitchen-sink (#5258)

Fix bug in example

Author: first-leon

demo/kitchen-sink/docs/lua.lua

@@ -33,6 +33,6 @@ print([===[
 --[=[--
 table.maxn is deprecated, use # instead.
 --]=]--
-print(table.maxn{1,2,[4]=4,[8]=8) -- outputs 8 instead of 2
+print(table.maxn{1,2,[4]=4,[8]=8}) -- outputs 8 instead of 2
 
-print(5 --[[ blah ]])
+print(5 --[[ blah ]])