Merge pull request #54 from d-v-b/master

fix some typos

Author: rougier

03-quickstart.rst

@@ -44,7 +44,7 @@ that are outside this range will be discarded or clipped (i.e. won't be visible
 on screen). This is called Normalized Device Coordinates, or NDC for short.
 This is something you cannot change because it is part of the OpenGL API and
 implemented in your hardware (GPU). Consequently, even if you intend to render
-the whole universe, you'll have utlimately to fit it into this small volume.
+the whole universe, you'll have ultimately to fit it into this small volume.
 
 The second important fact to know is that **x** coordinates increase from left
 to right and **y** coordinates increase from bottom to top. For this latter

04-maths.rst

@@ -35,7 +35,7 @@ this is the reason why we will use homogeneous coordinates that describe
 coordinates in a four-dimensional projective space (that includes the Euclidean
 space). We'll see in the next section that this allows us to express linear
 transformations (rotation, scaling), affine transformations (translations) and
-projection using 4×4 matrices. Homogeneous coordinatess are tightly linked with
+projection using 4×4 matrices. Homogeneous coordinates are tightly linked with
 regular 3D coordinates with the noticeable difference that they require a
 fourth `w` coordinate that corresponds to the fourth dimension, let's call it
 the projective dimension. In order to explain it, we'll use a 1-dimensional