More README cleanup

doc/formats/index.md

@@ -13,7 +13,7 @@ remake.
       * Lots of 8-byte reads when loading stuff in the mission editor
       * Some ~4K reads, havent found one corresponding to a known format yet
     * foo
-* `Assign/`
+* [`Assign/`](obj.md#assign)
     * `*.asn` # Unknown, seems to be related to .obj files 
 * `Cursor/`
     * `*.ani` # RIFF data
@@ -79,7 +79,7 @@ remake.
 * [`MultiMaps/`](maps.md#multimaps)
     * `*.MAP`
     * `*.TXT`
-* `Obj/`
+* [`Obj/`](obj.md)
     * `*.obj` # must be visual data of some sort, one per placeable map object?
 * `Pic/`
     * `*.pcx` # Standard .pcx format