PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows Angular commit message guidelines
• Tests for the changes have been added (not applicable for documentation changes)
• Docs have been added / updated

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

What is the current behavior?

The current RxJS interop documentation explains the core APIs (toSignal, toObservable, and rxResource) but does not provide practical migration guidance for developers transitioning from common RxJS patterns to Angular signals.

Issue Number: N/A

What is the new behavior?

This PR adds a migration guide for common RxJS patterns and their signal-based equivalents.

The documentation includes practical examples for:

• BehaviorSubject → signal
• combineLatest → computed
• switchMap → resource
• distinctUntilChanged → signal equality
• debounceTime → toObservable
• takeUntilDestroyed → automatic cleanup

Additional improvements include:

• Angular-style {avoid} and {prefer} migration examples
• improved example consistency and readability
• references to related RxJS interop documentation
• updated examples using Angular-recommended patterns

Does this PR introduce a breaking change?

• Yes
• No

Other information

This PR focuses on improving the migration experience for developers adopting Angular signals in existing RxJS-heavy applications.