docs(pds-icon): add technical notes on icon usage

[pixelflips]

Description

This PR adds a "Technical Notes" section to the pds-icon documentation to clarify the intentional differences in icon usage between React and web components.

Motivation: Developers may be confused about why React components use the icon property while web components use the name attribute. This documentation update explains the reasoning behind this design decision and helps developers understand the framework-specific optimizations.

Changes:

• Added a new "Technical Notes" section to pds-icon.mdx
• Documented that React uses icon property with imported icon objects for type safety, autocomplete, and tree-shaking
• Documented that web components use name attribute with string values for HTML-like syntax
• Clarified that using name in React triggers a warning and has no effect

No new dependencies are required for this change.

Fixes #(issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update (documentation-only change)

How Has This Been Tested?

• tested manually - Reviewed documentation rendering in Storybook
• unit tests
• e2e tests
• accessibility tests
• other:

Test Configuration:

• Pine versions: Current development version
• OS: macOS
• Browsers: N/A (documentation change)
• Screen readers: N/A
• Misc: Verified MDX syntax and formatting

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• Design has QA'ed and approved this PR

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[QuintonJason]

Nice docs!