docs: v18 announcement tweaks

[markwhitfeld]

This PR makes some modifications to the v18 announcement post, ahead of publication.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngxs/store/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

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✅ Successfully ran 4 targets

• nx run-many --target=test --all --configuration=ci --maxWorkers=4
• nx run-many --target=lint --all
• nx lint-types store
• nx run-many --target=build --all

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[bundlemon]

BundleMon (Integration Projects)

Unchanged files (2)

Status	Path	Size	Limits
✅	Main bundles(Gzip) hello-world-ng17/dist-integration/main.(hash) .js	69.46KB	+1%
✅	Main bundles(Gzip) hello-world-ng16/dist-integration/main.(hash) .js	68.47KB	+1%

No change in files bundle size

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[msmallest]

Will the root README.md be updated when this post is released, in a different PR?

I ask because having the root GitHub README.md differ from the docs one and NPM one, as well as v18 being released, has been a point of confusion for me about the formal status of the release and the messaging about it.

I know I can use v18 now, but I could see this being a point of confusion.

BTW nice release, good changes.

[codeclimate]

Code Climate has analyzed commit 12f1131 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 95.4% (0.0% change).

View more on Code Climate.