docs: update gtag docs to reflect what a GA4 tag looks like #7252
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Motivation
This PR is a follow on from #6184 which I mean to improve the docs for GA4 but actually didn't. This was discussed in #7221
The change made in this PR reflects the format required for GA4 properties which I'm successfully using here: https://github.com/johnnyreilly/blog.johnnyreilly.com/blob/4e824dc2172efca72c075f1dbc3a39a92fd22064/blog-website/docusaurus.config.js#L35
Have you read the Contributing Guidelines on pull requests?
Yes
Test Plan
No test - it's docs
Related PRs
See above