docs: add files.catReadableStream with cid instance to spec

License: MIT
Signed-off-by: Jacob Heun <[email protected]>

Author: jacobheun

SPEC/FILES.md

@@ -203,6 +203,7 @@ A great source of [examples][] can be found in the tests for this API.
 ipfsPath can be of type:
 
 - [`cid`][cid] of type:
+  - a [CID](https://github.com/ipfs/js-cid) instance
   - [Buffer][b], the raw Buffer of the cid
   - String, the base58 encoded version of the cid
 - String, including the ipfs handler, a cid and a path to traverse to, ie: