chore: fix broken docs link (#3513)

Author: andrew

README.md

@@ -27,7 +27,7 @@
   <br>
 </p>
 
-> A client library for the IPFS HTTP API, implemented in JavaScript. This client library implements the IPFS [Core API](https://github.com/ipfs/js-ipfs/tree/master/docs/api) enabling applications to change between an embedded js-ipfs node and any remote IPFS node without having to change the code. In addition, this client library implements a set of utility functions.
+> A client library for the IPFS HTTP API, implemented in JavaScript. This client library implements the IPFS [Core API](https://github.com/ipfs/js-ipfs/tree/master/docs/core-api) enabling applications to change between an embedded js-ipfs node and any remote IPFS node without having to change the code. In addition, this client library implements a set of utility functions.
 
 ## Lead Maintainer <!-- omit in toc -->