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

None

Assignee

Unassigned

Reporter

Lu

Components

Fix versions

Affects versions

Priority

Major