remove related notes button information in welcome-notes

[weilirs]

No description provided.

[greptile-apps]

PR Summary

Removes text highlighting feature documentation from welcome note while maintaining core Related Notes sidebar functionality description.

• Modified /src/lib/welcome-note.ts to remove text highlighting feature mention, potentially creating UX inconsistency with existing HighlightButton component in /src/components/Sidebars/SemanticSidebar/HighlightButton.tsx
• Consider updating SimilarEntriesComponent.tsx to reflect this UI change if the highlighting feature is being fully deprecated
• Ensure removal of feature documentation aligns with actual feature deprecation timing to avoid user confusion

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