Merge pull request #178 from Kurtil/patch-1

Fix typo in webgl-matrix-naming

Author: greggman

webgl/lessons/webgl-matrix-naming.md

@@ -36,7 +36,7 @@ Here's the list from my head
 
 * projection matrix
 
- a matrix and converts a frustum of space into clip space or some orthographic
+ a matrix that converts a frustum of space into clip space or some orthographic
  space into clip space. Another way of thinking about this is it's the matrix
  returned by your matrix math library's `perspective` and/or `ortho` or
  `orthographic` function.