Update Google tag in first party mode instructions

[simon-says]

Summary

List the correct instructions to navigate to the dashboard location of Google tag feature and clarify that a domain must be selected

Documentation checklist

• [ ✅ ] The documentation style guide has been adhered to.

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PR Change Summary

Updated instructions for navigating to the Google tag feature in the Cloudflare dashboard and clarified the requirement for domain selection.

• Revised navigation steps to access Google tag settings in the dashboard
• Clarified that a domain must be selected before configuring Google tag
• Adjusted the numbering of steps in the configuration process

Modified Files

• src/content/docs/google-tag-first-party-mode/index.mdx

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