Change definition of scanline in text.

[juliovr]

The text states that a scanline is only HDraw, and after that, comes a HBlank.

[exelotl]

Thanks for the PR!

There are some grammatical fixes needed:

• "After all the pixels in one line have been drawn"
• "The combination of these two is called a scanline."

But also, I'm unsure about the change overall.

The original text doesn't state that a scanline is only HDraw, it just says "After a scanline has been drawn [...] there is a pause" which to me implies there's a time during which the scanline is not being drawn. The GBA hardware is still on that scanline, it's just not drawing it anymore.

My understanding is that a scanline is just 'a row of pixels' and that the reader is supposed to infer from context whether it includes the HBlank period or not. In this chapter, a scanline includes both, but in other contexts it might not, so I'm unsure if a formal definition is needed.

I would like to hear others' opinions on this!

[GValiente]

I agree with @exelotl.