docs (p1): update hardware.inc to v5.3

Author: hlatourette

src/assets/hello-world.asm

@@ -56,7 +56,7 @@ CopyTilemap:
 	jp nz, CopyTilemap
 
 	; Turn the LCD on
-	ld a, LCDCF_ON | LCDCF_BGON
+	ld a, LCDC_ON | LCDCF_BG_ON
 	ld [rLCDC], a
 
 	; During the first (blank) frame, initialize display registers

src/part1/hello_world.md

@@ -8,7 +8,7 @@ It's a good idea to create a new directory (`mkdir gb_hello_world`, for example,
 
 Grab the following files (right-click each link, "Save Link As..."), and place them all in this new directory:
 - [`hello-world.asm`](../assets/hello-world.asm)
-- [`hardware.inc`](https://raw.githubusercontent.com/gbdev/hardware.inc/v4.0/hardware.inc)
+- [`hardware.inc`](https://raw.githubusercontent.com/gbdev/hardware.inc/v5.3.0/hardware.inc)
 
 Then, still from a terminal within that directory, run the following three commands.