scikit-learn/scikit-learn — pull request #2583 by amueller (2013-11-10 23:42:01+00:00)
Title: MRG DOC explanatory sentence for svm grid search example

Gave rule of thumb for rbf kernel parameter search prompted by [reddit question](http://www.reddit.com/r/MachineLearning/comments/1qbnp2/gridsearch_how_to_determine_the_range_of_c_and/?utm_source=twitterfeed&utm_medium=twitter).