docs: fix stray div

[dennispbrown]

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?

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

Other information

[IgorMinar]

please update the commit message with "and reformat paragraphs"

[mary-poppins]

You can preview d4de93b at https://pr21676-d4de93b.ngbuilds.io/.

[jenniferfell]

Problem remains. Need to remove the opening for a blue note that happens at Bootstrap

[mary-poppins]

You can preview 9adbac6 at https://pr21676-9adbac6.ngbuilds.io/.

[mary-poppins]

You can preview 4f423ce at https://pr21676-4f423ce.ngbuilds.io/.

[IgorMinar]

the preview looks good now.

I verified that the Jen's problem has been resolved

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