Clarify Event Raising in Structures and Add Code Example for Triggering Events

[shethaadit]

Summary

This update resolves confusion regarding event raising in structures by addressing the statement:
"Similarly, you can raise the salaryReviewTime event from outside the structure."

Key changes:

• Explained that events cannot be raised directly from outside the structure.
• Introduced a public method TriggerSalaryReview within the structure to raise the salaryReviewTime event.
• Added a code example demonstrating how to trigger the event through this method.

These changes ensure accurate guidance, improve clarity, and enhance developer understanding of event handling in Visual Basic structures.

Fixes #36231

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Internal previews

📄 File	🔗 Preview link
docs/visual-basic/programming-guide/language-features/data-types/how-to-declare-a-structure.md	How to: Declare a Structure (Visual Basic)

[BillWagner]

This LGTM @shethaadit

I'll now.