docs: update examples for latest libp2p rc (#353)

* docs: update chat example readme

* docs: update discovery test for autodial

* docs: fix delegated routing example

* docs: update echo example readme

* docs: fix libp2p in the browser example

* docs: update examples for peer/content routing

* docs: update the pubsub example

examples/echo/README.md

@@ -3,7 +3,7 @@
 This example performs a simple echo from the listener to the dialer.
 
 ## Setup
-1. Install the modules, `npm install`.
+1. Install the modules from libp2p root, `npm install`.
 2. Open 2 terminal windows in the `./src` directory.
 
 ## Running