fix(slo-config): add missing comma in system-config JSON example

[mdryaaan]

Summary

• Add missing comma after the clusterStrategy closing brace in the system-config JSON block — the JSON was syntactically invalid and would produce a parse
  error in koord-manager if copied into a ConfigMap as-is

Files Changed

• docs/user-manuals/slo-config.md — added , after clusterStrategy closing } (line 316)
• versioned_docs/version-v1.8/user-manuals/slo-config.md — same fix

Testing

• npm run build passes locally
• Checked versioned_docs/version-v1.8/ for same issue — fixed
• Checked i18n/zh-Hans/ counterpart — both current/user-manuals/slo-config.md and version-v1.8/user-manuals/slo-config.md exist and have the same bug;
  translation team needs to apply the same comma fix

Related

Fixes #336

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[mdryaaan]

/assign @ZiMengSheng