docs: copy edit getting started step 4

[kapunahelewong]

PR Checklist

Please check if your PR fulfills the following requirements:

• 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)

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

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Brings copy in line with Google guidelines. Also keeps location of getItems() consistent with previous step, Managing Data. In Managing Data, the cart service getItems() is in the ngOnInit(), but in the Forms step, it has moved to the constructor without instruction to do so.

Does this PR introduce a breaking change?

• Yes
• No

Other information

• Removes "we" per Google Developers Guide: https://developers.google.com/style/person
• Reduces future tense (for example "will be"): https://developers.google.com/style/tense
• Adds headers to code snippets
• Clears up passive voice
• Reduces parentheses: https://developers.google.com/style/parentheses

[mary-poppins]

You can preview cb60d78 at https://pr32839-cb60d78.ngbuilds.io/.

[jbogarthyde]

minor edits

[mary-poppins]

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[mary-poppins]

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[gkalpak]

👌

[mary-poppins]

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[mary-poppins]

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[kara]

@IgorMinar @StephenFluin Can someone review this for fw-docs-intro group approval?

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