Update threat intel source step

[jpipkin1]

Purpose of this pull request

This pull request updates the source ID step in the following articles:

• CrowdStrike Threat Intel Source
• Intel471 Threat Intel Source
• Mandiant Threat Intel Source
• STIX/TAXII 1 Client Source
• STIX/TAXII 2 Client Source
• ZeroFox Threat Intel Source

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)

Request in the #dochub Slack channel