FAQ syntax improvements - upgrade to es6 & async/await syntax (#57)

* fix FAQ first literal include

* upgrade to es6/async/await

* added await to client connection

Author: Mohammad Hunan Chughtai

source/code-snippets/faq/econnresetWithClientConnect-example.js

@@ -1,7 +1,7 @@
+const uri = "mongodb://localhost:27017/test?maxPoolSize=5000";
 // create a new MongoClient
-const client = new MongoClient(
-  "mongodb://localhost:27017/test?maxPoolSize=5000",
-);
-client.connect(function(err) {
+const client = new MongoClient(uri);
+
+await client.connect(err => {
   // connection
 });

source/code-snippets/faq/maxTimeMS-example.js

@@ -1,5 +1,5 @@
 // Execute a find command
-collection
+await collection
   .find({ $where: "sleep(100) || true" })
   .maxTimeMS(50)
-  .count(function(err, count) {});
+  .count((err, count) => {});