That is for literally just posting code, to share the code. It's handy if people ever want to share their code, for example, in a homebrew making guide of some sort.
For example, if I was to make a guide like Nerdy Nights, it might go like this:
Original thread: https://connect.gocollect.com/discussion/6082
The palettes start at PPU address $3F00 and $3F10. To set this address, PPU address port $2006 is used. This port must be written twice, once for the high byte then for the low byte:
LDA $2002 ; read PPU status to reset the high/low latch to high
LDA #$3F
STA $2006 ; write the high byte of $3F10 address
LDA #$10
STA $2006 ; write the low byte of $3F10 address