bfc01f936930d6c64a0e0765086e245d581d8432 doc: dseries/reporting: fix typo

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 453 | PASS: 447 | FAIL: 4 | XFAIL: 2 | XPASS: 0 | LIST OF FAILED TESTS: | * ep/rbc.mod | * ep/rbc2.mod | * ep/rbcii.mod | * ep/linearmodel.mod

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 451 | PASS: 445 | FAIL: 4 | XFAIL: 2 | XPASS: 0 | LIST OF FAILED TESTS: | * ep/rbc.mod | * ep/rbc2.mod | * ep/rbcii.mod | * ep/linearmodel.mod

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