docs(forms): add text about min() and max() as functions

[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: #18830

What is the new behavior?

Adds a comment that min and max are functions, not directives.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[kara]

Maybe clarify a bit to add suggested usage? Same for the other one.

... exists only as a validator function, not a directive. e.g.:

control = new FormControl('', Validators.min(3));

[kapunahelewong]

Thank you @kara! I've added this for each.

[IgorMinar]

@kapunahelewong can you please change the scope in the commit message from "aio" to "forms"? "aio" is just for angular.io application changes and this is a document content change so we should label it by the component it affects ("forms" in this case)

[kara]

LGTM (pending Igor's requested commit change)

[kapunahelewong]

Commit message changed and rebased. Thank you, @IgorMinar!

[IgorMinar]

@kapunahelewong did you forget to force push to the upstream branch? I don't see the changed commit message.

[IgorMinar]

I see. you changed the pull request subject and not the commit message.

to change the commit message you have to do the following:

git checkout wong-min-max
git commit --amend
# edit the commit message and save
git push origin wong-min-max --force-with-lease

[kapunahelewong]

@IgorMinar Oh! Sorry! I'm with you now. Thank you! :)

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