spelling: simplifying

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

src/6.pbr/2.2.1.ibl_specular/2.2.1.prefilter.fs

@@ -65,7 +65,7 @@ void main()
 {		
     vec3 N = normalize(WorldPos);
     
-    // make the simplyfying assumption that V equals R equals the normal 
+    // make the simplifying assumption that V equals R equals the normal 
     vec3 R = N;
     vec3 V = R;
 

src/6.pbr/2.2.2.ibl_specular_textured/2.2.2.prefilter.fs

@@ -65,7 +65,7 @@ void main()
 {		
     vec3 N = normalize(WorldPos);
     
-    // make the simplyfying assumption that V equals R equals the normal 
+    // make the simplifying assumption that V equals R equals the normal 
     vec3 R = N;
     vec3 V = R;