add curl examples for REST API documentation

Description

In Alluxio S3 REST API documentation https://www.alluxio.org/docs/master/en/Clients-S3.html, we provide example usage for s3 related REST APIs. To improve the readability of REST API docs, we also want to include example usage for s3 non-related REST APIs in https://www.alluxio.org/docs/master/en/Clients-Rest.html.

Modifies the REST API docs in ${ALLUXIO_HOME}/docs/en/Clients-Rest.md to include some examples as ${ALLUXIO_HOME}/docs/en/Clients-S3.md

It would be better to include usage example of some APIs that requires query parameters like mount and rename.

Environment

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Assignee

Unassigned

Reporter

Lu