Fix Sigv4 numbering bug (#5429)

* Update sigv4.md

Signed-off-by: Naarcha-AWS <[email protected]>

* Update sigv4.md

Signed-off-by: Naarcha-AWS <[email protected]>

---------

Signed-off-by: Naarcha-AWS <[email protected]>

Author: Naarcha-AWS

_benchmark/tutorials/sigv4.md

@@ -32,8 +32,7 @@ OpenSearch Benchmark supports AWS Signature Version 4 authentication. To run Ben
    ```
    {% include copy.html %}
 
-If you're testing against Amazon OpenSearch Serverless, set `OSB_SERVICE` to `aoss`.
-{: .note}
+  If you're testing against Amazon OpenSearch Serverless, set `OSB_SERVICE` to `aoss`.
 
 3. Customize and run the following `execute-test` command with the ` --client-options=amazon_aws_log_in:environment` flag. This flag tells OpenSearch Benchmark the location of your exported credentials.