Example: remove more things confusing to new adopters

- remove zImage since people were still thinking they needed to rename their kernel build product to zImage to have it work, while actually all filenames are detected and supported automatically, whether it's called zImage, zImage-dtb, Image.gz, Image.gz-dtb, Image.lz4-dtb, whatever (https://github.com/osm0sis/AnyKernel3/blob/7ccf4d62cede0527b7d895a8255f18b9b56046cc/tools/ak3-core.sh#L228); in fact it's extra important it be named correctly now with AK3 using magiskboot so that any appended *-dtb is supported correctly and doesn't get appended multiple times in subsequent flashes
- remove pointless patch file examples
- add unified tuna variant name just because I feel like it since it's otherwise not a working example anymore

DO NOT MERGE if you have already updated your ramdisk/anykernel.sh properly for your device

anykernel.sh

@@ -12,7 +12,7 @@ do.cleanuponabort=0
 device.name1=maguro
 device.name2=toro
 device.name3=toroplus
-device.name4=
+device.name4=tuna
 device.name5=
 supported.versions=
 '; } # end properties

patch/fstab

@@ -1,2 +0,0 @@
-# USB storage device
-/devices/platform/omap/musb-omap2430/musb-hdrc          auto                auto      defaults                                              voldmanaged=usbdisk:auto

patch/init.tuna

@@ -1,5 +0,0 @@
-service bootscript /sbin/bootscript.sh
-	class main
-	user root
-	group root
-	oneshot