The @Component inline-code span was directly adjacent to the [decorator](...) link, rendering as a mashed-together token in the source. Added a space so it reads "A @Component [decorator] that..." as intended.

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-docs/commit-message-guidelines.md
• 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.dev application / infrastructure changes
• Other... Please describe:

What is the current behavior?

In the "Defining a component" essentials guide, `@Component`[decorator](...)
had no space between the inline-code span and the link, so the source reads as
one mashed-together token. It only appears spaced in the rendered page because
of the inline-code background padding.

What is the new behavior?

Added a single space so the source reads `@Component` [decorator](...).
Renders identically/cleaner and is correct in the markdown source.

Does this PR introduce a breaking change?

• Yes
• No