Merge pull request #621 from zancas/master

doc-comment grammar fixups

plotters/src/coord/mod.rs

@@ -1,7 +1,7 @@
 /*!
 
 One of the key features of Plotters is flexible coordinate system abstraction and this module
-provides all the abstraction used for the coordinate abstarction of Plotters.
+provides all the abstraction used for the coordinate abstraction of Plotters.
 
 Generally speaking, the coordinate system in Plotters is responsible for mapping logic data points into
 pixel based backend coordinate. This task is abstracted by a simple trait called

plotters/src/coord/ranged2d/cartesian.rs

@@ -4,7 +4,7 @@
  This module provides the 2D cartesian coordinate system, which is composed by two independent
  ranged 1D coordinate specification.
 
- This types of coordinate system is used by the chart constructed with [ChartBuilder::build_cartesian_2d](../../chart/ChartBuilder.html#method.build_cartesian_2d).
+ This type of coordinate system is used by the chart constructed with [ChartBuilder::build_cartesian_2d](../../chart/ChartBuilder.html#method.build_cartesian_2d).
 */
 
 use crate::coord::ranged1d::{KeyPointHint, Ranged, ReversibleRanged};