Dead link to Blitter Object's DeadCScroll in ASM style guide

[nitro2k01]

gbdev.github.io/website/guides/asmstyle.md

Line 75 in 1f7f594

- Historically, RGBDS has required label definitions to begin at "column 1" (i.e. no whitespace before them on their line). However, later versions (with full support added in 0.5.0) allow [indenting labels](https://github.com/pinobatch/libbet/blob/cabe48bc4042338b9975cb32c2dbd0ee6640f31e/src/main.z80#L206-L231), for example to make loops stand out like in higher-level languages. However, [a lot of people don't do this](https://github.com/BlitterObjectBob/DeadCScroll/blob/9834372eb0d56e8b9a8cdcaae4b8aecb6d402266/DeadCScroll.asm#L410-L422), so it's up to you.