Two small typo fixes (#180)

src/pbrt/cmd/cyhair2pbrt.cpp

@@ -141,7 +141,7 @@ struct CyHairHeader {
   float default_thickness;
   float default_transparency;
   float default_color[3];
-  char infomation[88];
+  char information[88];
 };
 
 class CyHair {

src/pbrt/gpu/optix.cu

@@ -266,7 +266,7 @@ extern "C" __global__ void __miss__shadow() {
 }
 
 extern "C" __global__ void __raygen__shadow_Tr() {
-    PBRT_DBG("raygen sahadow tr %d\n", optixGetLaunchIndex().x);
+    PBRT_DBG("raygen shadow tr %d\n", optixGetLaunchIndex().x);
     int index = optixGetLaunchIndex().x;
     if (index >= params.shadowRayQueue->Size())
         return;