docs: adjust details on injectContainerState

[markwhitfeld]

This PR improves details around injectContainerState and removes references to v4 in the docs.

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:

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit 2b406df. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

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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)

Files updated (2)

Status	Path	Size	Limits
✅	Main bundles(Gzip) hello-world-ng16/dist-integration/main.(hash) .js	67.54KB (-1.06KB -1.55%)	+1%
✅	Main bundles(Gzip) hello-world-ng17/dist-integration/main.(hash) .js	68.53KB (-1.11KB -1.6%)	+1%

Total files change -2.18KB -1.57%

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history | Target branch size history

[codeclimate]

Code Climate has analyzed commit 2b406df 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 95.5% (0.0% change).

View more on Code Climate.