fix: add transport manager to exports map and fix docs (#1182)

Addresses PR comments from #1172 - fixes syntax of examples in docs, adds the transport manager to the exports map and renames fault tolerance enum for consistency.

doc/CONFIGURATION.md

@@ -246,8 +246,8 @@ import { GossipSub } from 'libp2p-gossipsub'
 
 const node = await createLibp2p({
   transports: [
-    TCP,
-    new WS() // It can take instances too!
+    new TCP(),
+    new WS()
   ],
   streamMuxers: [new Mplex()],
   connectionEncryption: [new Noise()],
@@ -697,8 +697,7 @@ import { createLibp2p } from 'libp2p'
 import { TCP } from '@libp2p/tcp'
 import { Mplex } from '@libp2p/mplex'
 import { Noise } from '@chainsafe/libp2p-noise'
-
-const { FaultTolerance } from 'libp2p/src/transport-manager')
+import { FaultTolerance } from 'libp2p/transport-manager'
 
 const node = await createLibp2p({
   transports: [new TCP()],

doc/STREAMING_ITERABLES.md

@@ -22,7 +22,7 @@
 Sometimes you may need to wrap an existing duplex stream in order to perform incoming and outgoing [transforms](#transform) on data. This type of wrapping is commonly used in stream encryption/decryption. Using [it-pair][it-pair] and [it-pipe][it-pipe], we can do this rather easily, given an existing [duplex iterable](#duplex).
 
 ```js
-const duplexPair from 'it-pair/duplex')
+import { duplexPair } from 'it-pair/duplex'
 import { pipe } from 'it-pipe'
 
 // Wrapper is what we will write and read from

doc/migrations/v0.26-v0.27.md

@@ -49,13 +49,13 @@ Protocol registration is very similar to how it previously was, however, the han
 
 **Before**
 ```js
-const pull from 'pull-stream')
+const pull = require('pull-stream')
 libp2p.handle('/echo/1.0.0', (protocol, conn) => pull(conn, conn))
 ```
 
 **After**
 ```js
-const pipe from 'it-pipe')
+const pipe = require('it-pipe')
 libp2p.handle(['/echo/1.0.0'], ({ protocol, stream }) => pipe(stream, stream))
 ```
 
@@ -65,7 +65,7 @@ libp2p.handle(['/echo/1.0.0'], ({ protocol, stream }) => pipe(stream, stream))
 
 **Before**
 ```js
-const pull from 'pull-stream')
+const pull = require('pull-stream')
 libp2p.dialProtocol(peerInfo, '/echo/1.0.0', (err, conn) => {
   if (err) { throw err }
   pull(
@@ -82,7 +82,7 @@ libp2p.dialProtocol(peerInfo, '/echo/1.0.0', (err, conn) => {
 
 **After**
 ```js
-const pipe from 'it-pipe')
+const pipe = require('it-pipe')
 const { protocol, stream } = await libp2p.dialProtocol(peerInfo, '/echo/1.0.0')
 await pipe(
   ['hey'],