Router API doc edit

[jbogarthyde]

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

Updating API doc for Router structures and utilities.
Organizing, editing and rewriting existing doc for consistency, style, and completeness.

• 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:

Does this PR introduce a breaking change?

• Yes
• No

Other information

Not touching Directives in this PR.

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[jbogarthyde]

Doc only, shouldn't need G3

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