Merge branch 'master' of https://www.github.com/ecomfe/zrender

src/graphic/IncrementalDisplayable.js

@@ -1,6 +1,6 @@
 /**
  * Displayable for incremental rendering. It will be rendered in a separate layer
- * IncrementalDisplay have too main methods. `clearDisplayables` and `addDisplayables`
+ * IncrementalDisplay have two main methods. `clearDisplayables` and `addDisplayables`
  * addDisplayables will render the added displayables incremetally.
  *
  * It use a not clearFlag to tell the painter don't clear the layer if it's the first element.