docs(router): add guide on using postrenderhooks

[santoshyadavdev]

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• vite-plugin-angular
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Closes #669

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[ajitzero]

I found this PR while looking up the docs for postRenderingHooks! Thanks for this, I will try this tonight.

I don't know much about the actual code, but noticed a few typos and grammar issues while going through this.

[brandonroberts]

Good feedback @ajitzero, thanks

[santoshyadavdev]

Thanks @ajitzero updated the PR