correct debug message

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6233 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: add common pitfalls page - do not call api functions in global scope

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6234 8aca7d54-2c30-db11-9de9-000461428c89