docs: the keyword is docs, not doc (#2502)

Author: daviddias

.gitignore

@@ -2,7 +2,6 @@
 **/*.log
 test/repo-tests*
 **/bundle.js
-docs
 # Logs
 logs
 *.log

README.md

@@ -373,7 +373,7 @@ Enable and configure experimental features.
 |------|---------|
 | object |  [`config-nodejs.js`](https://github.com/ipfs/js-ipfs/tree/master/src/core/runtime/config-nodejs.js) in Node.js, [`config-browser.js`](https://github.com/ipfs/js-ipfs/tree/master/src/core/runtime/config-browser.js) in browsers |
 
-Modify the default IPFS node config. This object will be *merged* with the default config; it will not replace it. The default config is documented in [the js-ipfs config file doc](doc/config.md).
+Modify the default IPFS node config. This object will be *merged* with the default config; it will not replace it. The default config is documented in [the js-ipfs config file docs](docs/config.md).
 
 ###### Configuring Delegate Routers