developers: stone: Turn bits into bytes

Author: livingsilver94

src/content/docs/Developers/Stone/index.mdx

@@ -30,10 +30,10 @@ Described below is the general (that is, version-agnostic) layout of a *stone*.
   }
 }%%
 packet
-+32: "Prelude — 32 bits"
-+16: "Payload 1 header — 32 bits"
++32: "Prelude — 32 bytes"
++16: "Payload 1 header — 32 bytes"
 +16: "Payload 1 records — Variable length"
-+16: "Payload 2 header — 32 bits"
++16: "Payload 2 header — 32 bytes"
 +16: "Payload 2 records — Variable length"
 +32: "[...]"
 ```