FIX : omp default param could fail
ENH : use local seed + avoid warning
CLN: Capitalize "Gaussian" in example docstrings
Merge pull request #3176 from agramfort/omp_default

MRG : omp default param could fail
Merge pull request #3230 from bwignall/quickfix-gaussian

CLN: Capitalize "Gaussian" in example docstrings
CLN: Capitalize "Dirichlet" and "Mexican" in example docstrings
Merge pull request #3231 from bwignall/quickfix-cap

CLN: Capitalize "Dirichlet" and "Mexican" in example docstrings