e29990df62c78528cf33c119b68ffebbf70719a4 Improve documentation on nonlinear solver algorithms

================================ DYNARE MAKE CHECK MATLAB RESULTS ================================ | TOTAL: 214 | PASS: 213 | FAIL: 0 | XFAIL: 1 | XPASS: 0

================================ DYNARE MAKE CHECK OCTAVE RESULTS ================================ | TOTAL: 212 | PASS: 211 | FAIL: 0 | XFAIL: 1 | XPASS: 0

A full log can be found on karaba in '/tmp/dynare-master-check-tVpYKimH39.log'.