Replace jpgs with pngs, the latter of which are supported and displayed.

Reported by:	    meena (on EFnet IRC #bsddocs channel)

en_US.ISO8859-1/books/handbook/Makefile

@@ -161,32 +161,32 @@ IMAGES_EN+= wine/wine-config-6.png
 IMAGES_EN+= wine/wine-config-7.png
 IMAGES_EN+= wine/winetricks-run-1.png
 IMAGES_EN+= wine/winetricks-run-2.png
-IMAGES_EN+= wine/winetricks-menu-1.jpg
-IMAGES_EN+= wine/winetricks-uninstall-1.jpg
-IMAGES_EN+= wine/winetricks-uninstall-2.jpg
-IMAGES_EN+= wine/winetricks-uninstall-3.jpg
-IMAGES_EN+= wine/homura-launch-1.jpg
-IMAGES_EN+= wine/homura-run-2.jpg
-IMAGES_EN+= wine/homura-run-3.jpg
-IMAGES_EN+= wine/homura-install-1.jpg
-IMAGES_EN+= wine/homura-install-2.jpg
-IMAGES_EN+= wine/homura-install-3.jpg
-IMAGES_EN+= wine/homura-install-4.jpg
-IMAGES_EN+= wine/homura-install-5.jpg
-IMAGES_EN+= wine/homura-install-6.jpg
-IMAGES_EN+= wine/homura-install-7.jpg
-IMAGES_EN+= wine/homura-install-8.jpg
-IMAGES_EN+= wine/homura-uninstall-1.jpg
-IMAGES_EN+= wine/homura-run-2.jpg
-IMAGES_EN+= wine/homura-run-3.jpg
+IMAGES_EN+= wine/winetricks-menu-1.png
+IMAGES_EN+= wine/winetricks-uninstall-1.png
+IMAGES_EN+= wine/winetricks-uninstall-2.png
+IMAGES_EN+= wine/winetricks-uninstall-3.png
+IMAGES_EN+= wine/homura-launch-1.png
+IMAGES_EN+= wine/homura-run-2.png
+IMAGES_EN+= wine/homura-run-3.png
+IMAGES_EN+= wine/homura-install-1.png
+IMAGES_EN+= wine/homura-install-2.png
+IMAGES_EN+= wine/homura-install-3.png
+IMAGES_EN+= wine/homura-install-4.png
+IMAGES_EN+= wine/homura-install-5.png
+IMAGES_EN+= wine/homura-install-6.png
+IMAGES_EN+= wine/homura-install-7.png
+IMAGES_EN+= wine/homura-install-8.png
+IMAGES_EN+= wine/homura-uninstall-1.png
+IMAGES_EN+= wine/homura-run-2.png
+IMAGES_EN+= wine/homura-run-3.png
 IMAGES_EN+= wine/winetricks-run-1.png
 IMAGES_EN+= wine/winetricks-run-2.png
 IMAGES_EN+= wine/winetricks-app-install-1.png
 IMAGES_EN+= wine/winetricks-app-install-2.png
-IMAGES_EN+= wine/winetricks-menu-1.jpg
-IMAGES_EN+= wine/winetricks-uninstall-1.jpg
-IMAGES_EN+= wine/winetricks-uninstall-2.jpg
-IMAGES_EN+= wine/winetricks-uninstall-3.jpg
+IMAGES_EN+= wine/winetricks-menu-1.png
+IMAGES_EN+= wine/winetricks-uninstall-1.png
+IMAGES_EN+= wine/winetricks-uninstall-2.png
+IMAGES_EN+= wine/winetricks-uninstall-3.png
 
 # Images from the cross-document image library
 IMAGES_LIB=  callouts/1.png