Typo

"In particularly" -> "In particular,"
FIX revert changes introduced by mistake in previous commit

If the dataset is too small, stratified k-fold CV used
internally by some classifiers such as LogisticRegressionCV
raises a warning.
Merge pull request #3492 from furukama/patch-2

Typo
MAINT: Effectively remove deprecated parameters
DOC fix styling of See Also sections
DOC fix styling of method signatures
ENH multinomial logistic regression using L-BFGS