Remove striped output example

Doesn't really add much value.

blog/content/edition-3/posts/02-booting/index.md

@@ -1104,30 +1104,6 @@ We see that our guess that the whole screen would turn gray was right:
 
 We finally see some output from our little kernel!
 
-You can try experimenting with the pixel bytes if you like, for example by increasing the pixel value on each loop iteration:
-
-```rust ,hl_lines=5-9
-// in src/kernel/main.rs
-
-fn kernel_main(boot_info: &'static mut BootInfo) -> ! {
-    if let Some(framebuffer) = boot_info.framebuffer.as_mut() {
-        let mut value = 0x90;
-        for byte in framebuffer.buffer_mut() {
-            *byte = value;
-            value = value.wrapping_add(7);
-        }
-    }
-    loop {}
-}
-```
-
-We use the [`wrapping_add`] method here because Rust panics on implicit integer overflow (at least in debug mode).
-The result looks as follows:
-
-[`wrapping_add`]: https://doc.rust-lang.org/std/primitive.u8.html#method.wrapping_add
-
-![QEMU showing repeating gradient columns](qemu-wrapping-add.png)
-
 ### Booting on Real Hardware
 
 To boot on real hardware, write either the `uefi.img` or the `bios.img` disk image to an USB thumb drive.

blog/content/edition-3/posts/03-screen-output/index.md

@@ -38,7 +38,7 @@ The complete source code for this post can be found in the [`post-3.3`][post bra
 
 In the [previous post], we learned how to make our minimal kernel bootable.
 Using the [`BootInfo`] provided by the bootloader, we were able to access a special memory region called the _[framebuffer]_, which controls the screen output.
-We wrote some example code to display a gray stripe pattern:
+We wrote some example code to display a gray background:
 
 [previous post]: @/edition-3/posts/02-booting/index.md
 [`BootInfo`]: https://docs.rs/bootloader_api/latest/bootloader_api/info/struct.BootInfo.html
@@ -48,10 +48,8 @@ We wrote some example code to display a gray stripe pattern:
 
 fn kernel_main(boot_info: &'static mut BootInfo) -> ! {
     if let Some(framebuffer) = boot_info.framebuffer.as_mut() {
-        let mut value = 0x90;
         for byte in framebuffer.buffer_mut() {
-            *byte = value;
+            *byte = 0x90;
-            value = value.wrapping_add(7);
         }
     }
     loop {}