6502 Reference Link Invalid

[Brett Holman]

The link on this page doesn't point to reference manual.

https://www.obelisk.me.uk/6502/reference.html

[Brett Holman]

Also a missing link to the instruction set manual on this page:

nes_ebook/src/chapter_3_3.md

Line 22 in 0f7f573

 If you get stuck, you can always look up the implementation of 6502 instruction set here: <link to code> 

[soothsayer]

The link on this page doesn't point to reference manual.

obelisk.me.uk/6502/reference.html

You can refer this

[Rafael Bagmanov]

thanks @holmanb and @Adam-Teng. fixed now!