Fix error in example code for estimate set of surface for a subset of points in the input dataset #2203
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I found an error in the example code in how_features_work.rst. The error was in the example code for estimate set of surface for a subset of points in the input dataset. The error was on Line 11 for loop.
![before_pcl_how_features_work](https://user-images.githubusercontent.com/26876782/35844936-e2f2154e-0b4a-11e8-8554-6493d328cd5f.png)
Before correction,
After correction,
![after_pcl_how_features_work](https://user-images.githubusercontent.com/26876782/35844986-389ab4b0-0b4b-11e8-9824-1209d862bd3c.png)