fix(s3-request-presigner): address feedbacks

Author: AllanZhengYP

packages/s3-request-presigner/README.md

@@ -15,7 +15,7 @@ JavaScript Example:
 ```javascript
 const { getSignedUrl } = require("@aws-sdk/s3-request-presigner");
 const { S3Client, GetObjectCommand } = require("@aws-sdk/client-s3");
-const client = new S3Client(construcParams);
+const client = new S3Client(clientParams);
 const command = new GetObjectCommand(getObjectParams);
 const url = await getSignedUrl(client, command, { expiresIn: 3600 });
 ```
@@ -25,7 +25,7 @@ ES6 Example
 ```javascript
 import { getSignedUrl } from "@aws-sdk/s3-request-presigner";
 import { S3Client, GetObjectCommand } from "@aws-sdk/client-s3";
-const client = new S3Client(construcParams);
+const client = new S3Client(clientParams);
 const command = new GetObjectCommand(getObjectParams);
 const url = await getSignedUrl(client, command, { expiresIn: 3600 });
 ```

packages/s3-request-presigner/src/getSignedUrl.ts

@@ -52,7 +52,6 @@ export const getSignedUrl = async <
     //@ts-ignore the output is faked, so it's not actually OutputType
     presigned = output.presigned;
   } finally {
-    // client middleware stack should not be altered by this function
     client.middlewareStack.remove("presignInterceptMiddleware");
   }