[DOCS][ZEPPELIN-1586] Add 'Security' section under notebook restapi docs #1825
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What is this PR for?
After #1567 merged we can get/set note permission info for a certain note. But this info is not described in anywhere for now. So I added "Security" section under docs/rest-api/rest-notebook.md.
And currently so many operations are placed under one section like below.

So I split them under each

Note opersions,Paragraph operations,Cron jobs, andPermissionsection.What type of PR is it?
Documentation
What is the Jira issue?
ZEPPELIN-1877
How should this be tested?
Please see the below screenshots :)
Screenshots (if appropriate)
Questions: