[IGNITE-8654] Move SET command documentation to Operational Commands section

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.7
• Component/s: documentation
• Assignee: Artem Budnikov
• Reporter: Denis A. Magda
• Created: 30/May/18 23:15
• Updated: 07/Sep/18 15:20
• Resolved: 07/Sep/18 15:20

Description

We need to be consistent and document SQL commands under SQL Reference section.

So, move and slightly rework (no need to show step by step JDBC example) the doc from here:
https://apacheignite-sql.readme.io/v2.5/docs/jdbc-driver#section-streaming

there:
https://apacheignite-sql.readme.io/v2.5/docs/set

Once moved, ensure the format complies with the rest of the commands and there is a callout saying the feature is supported for JDBC only. Refer to COPY as to an example:
https://apacheignite-sql.readme.io/v2.5/docs/copy