docs: add example and edit two-way binding section of Template Syntax

[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
[x] 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?

Rewrite and addition of an example for the two-way binding section.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

This is the 6th installment of the Template Syntax rewrite so that it can be broken into separate documents.

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[brandonroberts]

Caretaker note: The Codefresh job is unrelated and still pending. I am using a global approval

[AndrewKushnir]

@kapunahelewong, it looks like this PR now has a conflict with master branch after merging PR 25561 that also updated .github/CODEOWNERS file. Could you please rebase this PR and resolve conflict(s)? Feel free to add "merge" label back once PR is updated. Thank you.

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