Fix extra character, service naming, and extra header. (#4295)

Author: cpyle0819

javascriptv3/example_code/sts/README.md

@@ -1,4 +1,4 @@
-# [AWS STS code examples for the SDK for JavaScript (v3)
+# AWS STS code examples for the SDK for JavaScript (v3)
 
 ## Overview
 
@@ -15,8 +15,6 @@ AWS provides AWS STS as a web service that enables you to request temporary, lim
 
 ## Code examples
 
-### Get started
-
 ### Single actions
 
 Code excerpts that show you how to call individual service functions.

javascriptv3/example_code/sts/libs/client.js

@@ -7,6 +7,6 @@
 import { STSClient } from "@aws-sdk/client-sts";
 // Set the AWS Region.
 const REGION = "us-east-1";
-// Create an Amazon STS service client object.
+// Create an AWS STS service client object.
 export const client = new STSClient({ region: REGION });
 // snippet-end:[javascript.v3.sts.client]