docs: remove mention of project settings from analytics

[clydin]

These settings are not yet implemented and will be available in 8.1.

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?

Analytics project settings are not yet implemented in 8.0 but are present in the documentation.

What is the new behavior?

References to analytics project settings have been removed.

Does this PR introduce a breaking change?

• Yes
• No

Other information

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