spark git commit: [SPARK-7808] [ML] add package doc for ml.feature

Repository: spark Updated Branches: refs/heads/branch-1.5 bfb4c8425 - 35542504c [SPARK-7808] [ML] add package doc for ml.feature This PR adds a short description of `ml.feature` package with code example. The Java package doc will come in a separate PR. jkbradley Author: Xiangrui Meng

spark git commit: [SPARK-7808] [ML] add package doc for ml.feature

Repository: spark Updated Branches: refs/heads/master ee093c8b9 - e290029a3 [SPARK-7808] [ML] add package doc for ml.feature This PR adds a short description of `ml.feature` package with code example. The Java package doc will come in a separate PR. jkbradley Author: Xiangrui Meng