fix some typos

src/point.rs

@@ -14,7 +14,7 @@
 // limitations under the License.
 
 //! Points are fixed positions in affine space with no length or direction. This
-//! disinguishes them from vectors, which have a length and direction, but do
+//! distinguishes them from vectors, which have a length and direction, but do
 //! not have a fixed position.
 
 use num_traits::{NumCast, Bounded};

src/projection.rs

@@ -35,9 +35,9 @@ pub fn perspective<S: BaseFloat, A: Into<Rad<S>>>(fovy: A, aspect: S, near: S, f
     }.into()
 }
 
-/// Create a perspective matrix from a view frustrum.
+/// Create a perspective matrix from a view frustum.
 ///
-/// This is the equivalent of the now deprecated [glFrustrum]
+/// This is the equivalent of the now deprecated [glFrustum]
 /// (http://www.opengl.org/sdk/docs/man2/xhtml/glFrustum.xml) function.
 pub fn frustum<S: BaseFloat>(left: S, right: S, bottom: S, top: S, near: S, far: S) -> Matrix4<S> {
     Perspective {

src/quaternion.rs

@@ -128,7 +128,7 @@ impl<S: BaseFloat> Quaternion<S> {
         (self * (S::one() - amount) + other * amount).normalize()
     }
 
-    /// Spherical Linear Intoperlation
+    /// Spherical Linear Interpolation
     ///
     /// Return the spherical linear interpolation between the quaternion and
     /// `other`. Both quaternions should be normalized first.
@@ -136,7 +136,7 @@ impl<S: BaseFloat> Quaternion<S> {
     /// # Performance notes
     ///
     /// The `acos` operation used in `slerp` is an expensive operation, so
-    /// unless your quarternions are far away from each other it's generally
+    /// unless your quaternions are far away from each other it's generally
     /// more advisable to use `nlerp` when you know your rotations are going
     /// to be small.
     ///