Polymer/core-icons — pull request #13 by bslatkin (2014-12-21 01:51:10+00:00)
Title: Adds usage information for each icon set.

This was really frustrating for me because the explanation of usage is in the last sentence of the first section [of this page](https://www.polymer-project.org/docs/elements/icons.html#using-polymers-built-in-icon-sets) and basically nowhere else. This change puts the usage information right on the sheet of example icons so it's easier for newbies to figure it out.