improved incident response documentation

[swethaa-11]

Implemented the suggested documentation improvements and security-focused refinements.

Changes made include:

• Added an internal classification label for organisational use awareness
• Added clarification that iptables blocking rules are temporary unless persisted
• Added guidance regarding anonymisation/sanitisation of logs and identifiers before sharing documentation externally

These updates improve the overall security awareness, operational clarity, and professionalism of the incident response documentation.

[github-actions]

🔒 OWASP Scanner Results

No vulnerabilities detected.

### File: docs/cybersecurity/Blue Team/Onboarding/Port Security.md

🔒 OWASP Scanner Results for docs/cybersecurity/Blue Team/Onboarding/Port Security.md

✅ No vulnerabilities found.

### File: incident response documentation.md

🔒 OWASP Scanner Results for incident response documentation.md

✅ No vulnerabilities found.

✅ Good to go.

[github-actions]

🔒 OWASP Scanner Results

No vulnerabilities detected.

### File: incident response documentation.md

🔒 OWASP Scanner Results for incident response documentation.md

✅ No vulnerabilities found.

✅ Good to go.

[raymondchoy14]

All good