d212197ecb327b97adc3c38db2b7805b8365efcd Fix incorrect usage of @xref

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 214 | PASS: 212 | FAIL: 1 | XFAIL: 1 | XPASS: 0 | LIST OF FAILED TESTS: | * measurement_errors/fs2000_corr_me_ml_mcmc/fs2000_corr_ME.mod

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 212 | PASS: 208 | FAIL: 3 | XFAIL: 1 | XPASS: 0 | LIST OF FAILED TESTS: | * measurement_errors/fs2000_corr_me_ml_mcmc/fs2000_corr_ME.mod | * block_bytecode/run_ls2003.m(0,1,0,0) | * block_bytecode/run_ls2003.m(1,1,0,0)

A full log can be found on karaba in '/tmp/dynare-master-check-gyKBI4bMpW.log'.