docs(core): DI module-level info fix

[renanmontebelo]

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• The commit message follows our guidelines: https://github.com/angular/angular/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)

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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
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

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Does this PR introduce a breaking change?

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Other information

[kapunahelewong]

These are good fixes and I made the first one in a PR that has since evolved into a larger rewrite of this guide (including this paragraph being largely rethought). @renanmontebelo check out where how it stands right now: Hierarchical Injectors updates in 28700.

Thank you for taking the time to fix this. 🌺
EDIT: Never mind my previous comments. LGTM, but you still might like to see that other PR. Comments are welcome!

[renanmontebelo]

These are good fixes and I made the first one in a PR that has since evolved into a larger rewrite of this guide (including this paragraph being largely rethought). @renanmontebelo check out where how it stands right now: Hierarchical Injectors updates in 28700.

Thank you for taking the time to fix this. 🌺
EDIT: Never mind my previous comments. LGTM, but you still might like to see that other PR. Comments are welcome!

Hi @kapunahelewong , thanks for your comments. I agree with you, this whole section deserves a good refactoring. As this PR was closed I'll chime in 28700. Thanks!

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