Document soundbank findings

ackit/wad.py

@@ -11,7 +11,7 @@ Layout (little endian):
   0x1C  N x {u32 hash, u32 size, u32 offset}   sorted by hash as *signed* int32
 Entries are stored in table order, each at a 0x1000-aligned offset; 'size' is the
 entry payload size padded to 0x800. Padding bytes are zero; the file ends 0x1000-aligned.
-See docs/wad_format.md.
+See docs/formats/wad.md.
 """
 import struct
 from dataclasses import dataclass