Manage Organizations for MSSPs - Cloud SIEM (RN)

[JV0812]

Purpose of this pull request

This pull request is to add release note for Cloud SIEM rule and rule tuning expression support (MSSP).

Select the type of change

• Minor Changes - Typos, formatting, slight revisions
• Update Content - Revisions, updating sections
• New Content - New features, sections, pages, tutorials
• Site and Tools - .clabot, version updates, maintenance, dependencies, new packages for the site (Docusaurus, Gatsby, React, etc.)

Ticket (if applicable)

[kimsauce]

Should the date be Sept 16 (instead of Oct)?

[JV0812]

Thanks for your review @kimsauce. Yes it should be September, just lost the count of months.