Fix a typo (togheter -> together)


mysql-test/mysql-test-run.pl:
  Fix a typo (togheter -> together)
storage/ndb/test/include/NDBT_Error.hpp:
  Fix a typo (togheter -> together)
storage/ndb/test/include/NDBT_ReturnCodes.h:
  Fix a typo (togheter -> together)