Add lps_coroutine.lua as example in docs

Author: gilzoide

config.ld

@@ -5,4 +5,4 @@ file = { "src", "lps_coroutine.lua" }
 boilerplate = true
 sort = true
 dir = "docs"
-examples = { "plugin/lua_repl.lua" }
+examples = { "lps_coroutine.lua", "plugin/lua_repl.lua" }