Govern: Threat Insights Group documentation updates

Please be sure to double-check the file for any other version mentions as vale can miss.

Once a merge request is created link it to this issue. Note - only 1 merge request per issue to reduce the overhead as the technical writing team needs to review all changes.

Affected files:

 gitlab/doc/api/vulnerability_exports.md
 13:75   suggestion  If possible, remove the reference to 'GitLab 12.'.  gitlab.OutdatedVersions 
 13:163  suggestion  If possible, remove the reference to 'GitLab 13.'.  gitlab.OutdatedVersions 


 gitlab/doc/api/project_vulnerabilities.md
 13:74  suggestion  If possible, remove the reference to 'GitLab 12.'.  gitlab.OutdatedVersions 


 gitlab/doc/api/vulnerabilities.md
 13:74  suggestion  If possible, remove the reference to 'GitLab 12.'.  gitlab.OutdatedVersions 


 gitlab/doc/api/vulnerability_findings.md
 13:82  suggestion  If possible, remove the reference to 'GitLab 12.'.  gitlab.OutdatedVersions 
 57:16  suggestion  If possible, remove the reference to 'GitLab 12.'.  gitlab.OutdatedVersions 


 gitlab/doc/user/application_security/vulnerabilities/index.md
 306:72  suggestion  If possible, remove the reference to 'GitLab 14.'.  gitlab.OutdatedVersions 
 326:72  suggestion  If possible, remove the reference to 'GitLab 14.'.  gitlab.OutdatedVersions 


 gitlab/doc/user/application_security/vulnerability_report/index.md
 268:75  suggestion  If possible, remove the reference to 'GitLab 14.'.  gitlab.OutdatedVersions 
 269:86  suggestion  If possible, remove the reference to 'GitLab 14.'.  gitlab.OutdatedVersions 
 304:72  suggestion  If possible, remove the reference to 'GitLab 14.'.  gitlab.OutdatedVersions 


 gitlab/doc/user/application_security/security_dashboard/index.md
 112:72  suggestion  If possible, remove the reference to 'GitLab 13.'.  gitlab.OutdatedVersions 


 gitlab/doc/user/application_security/cve_id_request.md
 13:82  suggestion  If possible, remove the reference to 'GitLab 13.'.  gitlab.OutdatedVersions 

✔ 0 errors, 0 warnings and 13 suggestions in 15 files.