doc: fix PS/2 recipe

During the recipe overhaul, I forgot to carry PS/2 schematics over. Also, the recipe should go in hw/z80 because it's specific to Z80.
2020-12-05 19:46:10 -05:00 · 2020-12-05 19:46:10 -05:00 · b12ac4b672
--- a/doc/hw/z80/code/ps2ctl.asm
+++ b/doc/hw/z80/code/ps2ctl.asm
--- a/doc/hw/z80/img/ps2-595.png
+++ b/doc/hw/z80/img/ps2-595.png
--- a/doc/hw/z80/img/ps2-conn.png
+++ b/doc/hw/z80/img/ps2-conn.png
--- a/doc/hw/z80/img/ps2-t45.png
+++ b/doc/hw/z80/img/ps2-t45.png
--- a/doc/hw/z80/img/ps2-z80.png
+++ b/doc/hw/z80/img/ps2-z80.png
--- a/doc/hw/z80/ps2.txt
+++ b/doc/hw/z80/ps2.txt