The surrounding @SkipSelf and @host examples already use inject(), and the section intro recommends it. Align the @self example to match.

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• 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)
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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?

The @Self() example in the "Resolution modifiers" section of the hierarchical DI guide uses constructor-based injection (constructor(@Self() public flower: FlowerService) {}), while the section intro recommends using each modifier in the inject() configuration, and the surrounding @SkipSelf and @Host examples (and the other @Self example in the same section) already use the inject() form.

Issue Number: N/A

What is the new behavior?

The @Self() example now uses inject(FlowerService, {self: true}), matching the surrounding examples and the section's stated guidance. The dedicated "Modifiers with constructor injection" subsection still documents the legacy decorator-based form.

Does this PR introduce a breaking change?

• Yes
• No

Other information