fix typo (#132)

davechilders · hadley · commit 106ee05189c6 · 2019-06-17T09:15:56.000-05:00
diff --git a/layers.rmd b/layers.rmd
@@ -300,7 +300,7 @@ Geometric objects, or **geoms** for short, perform the actual rendering of the l
     * `geom_ribbon()`: ribbons, a path with vertical thickness.
     * `geom_segment()`: a line segment, specified by start and end position.
     * `geom_rect()`: rectangles.
-    * `geom_polyon()`: filled polygons.
+    * `geom_polygon()`: filled polygons.
     * `geom_text()`: text.
   
 * One variable:
