Remove outdated loglevel list from a l_util.cpp comment,
and rather point to the updated code.
// log([level,] text)
// Writes a line to the logger.
// The one-argument version logs to infostream.
-// The two-argument version accept a log level: error, action, info, or verbose.
+// The two-argument version accepts a log level.
+// Either the special case "deprecated" for deprecation notices, or any specified in
+// Logger::stringToLevel(name).
int ModApiUtil::l_log(lua_State *L)
{
NO_MAP_LOCK_REQUIRED;