docs: api docs link in readme

[0xmanny]

fix api docs link in readme

change from https://ipfs.github.io/helia-verified-fetch/modules/ to https://ipfs.github.io/helia-verified-fetch/modules/_helia_verified_fetch.html

Description

https://ipfs.github.io/helia-verified-fetch/modules/ give 404

Change checklist

• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation if necessary (this includes comments as well)
• [] I have added tests that prove my fix is effective or that my feature works