style cleanup: spelling.

also remove large, duplicate comments from sunsky.h

source/blender/editors/interface/interface_draw.c

@@ -1052,7 +1052,7 @@ void ui_draw_but_COLORBAND(uiBut *but, uiWidgetColors *UNUSED(wcol), rcti *rect)
 	float x1, y1, sizex, sizey;
 	float v3[2], v1[2], v2[2], v1a[2], v2a[2];
 	int a;
-	float pos, colf[4]= {0,0,0,0}; /* initialize incase the colorband isnt valid */
+	float pos, colf[4]= {0,0,0,0}; /* initialize in case the colorband isnt valid */
 		
 	coba= (ColorBand *)(but->editcoba? but->editcoba: but->poin);
 	if(coba==NULL) return;