docs(core): added value accessor info under angular setup guide

[GayatriK2002]

💡 What is the current behavior?

• No information about importing ix value accessor for form components in ix-docs

GitHub Issue Number: #1901

🆕 What is the new behavior?

• Added information section under angular setup page instructing users to import value accessors from @siemens/ix-angular/standalone

👨‍💻 Help & support

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🔨 Latest commit	3e7f7f6

[gemini-code-assist]

Summary of Changes

Hello @GayatriK2002, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Angular installation documentation by addressing a critical missing piece of information for standalone setups. It introduces a new section that guides developers on correctly importing ix value accessor for iX form components, thereby preventing a common runtime error and improving the overall developer experience when integrating the library with Angular standalone applications.

Highlights

• Documentation Update: An important informational section has been added to the Angular setup guide, specifically for standalone applications.
• Error Prevention: The new documentation provides clear instructions on how to import ix value accessor from @siemens/ix-angular/standalone to prevent common 'No value accessor' errors when using iX form components.

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[gemini-code-assist]

Code Review

This pull request adds an important note for developers using Angular standalone components with iX form components. My review focuses on ensuring the new documentation aligns with the project's style guide. I've suggested a few minor changes to improve consistency with the established tone and formatting conventions.