Hardcoded paths to ../../src/bin avoid one step in the instructions.

contrib/bochs/bochsrc.txt

@@ -144,7 +144,7 @@ megs: 32
 #optromimage2: file=optionalrom.bin, address=0xd1000
 #optromimage3: file=optionalrom.bin, address=0xd2000
 #optromimage4: file=optionalrom.bin, address=0xd3000
-optromimage1: file=rom.img, address=0xd0000
+optromimage1: file=../../src/bin/pnic.zrom, address=0xd0000
 
 #optramimage1: file=/path/file1.img, address=0x0010000
 #optramimage2: file=/path/file2.img, address=0x0020000
@@ -198,7 +198,7 @@ vga: extension=none
 #floppya: 1_44=a:, status=inserted
 #floppya: 1_44=a.img, status=inserted
 #floppya: 1_44=/dev/rfd0a, status=inserted
-floppya: 1_44=floppy.img, status=inserted
+floppya: 1_44=../../src/bin/pnic.dsk, status=inserted
 
 #=======================================================================
 # FLOPPYB: