docs(core): add missing space

[ehlemur]

Add missing space after period in section describing producers and consumers.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/main/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?

There is a missing space after the period in the section documenting producers and consumers.

Issue Number: N/A

What is the new behavior?

Add the missing space.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[thePunderWoman]

Caretaker note: This is very minor docs change and is safe to merge without a TGP.

[pkozlowski-opensource]

This PR was merged into the repository by commit 6fef658.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}