fix(docs): address decimal documentation feedback

[r-near]

Summary

Addresses feedback from PR #450 review.

Changes

1. Fixed text/example mismatch: Intro now correctly describes wNEAR→Ethereum (matches the code example)
2. Fixed math error: Corrected 10^17 / 10^6 = 10^11 = 100000000000 (was missing a zero)
3. Clarified WETH Solana decimals: Added footnote explaining WETH uses 8 decimals (Wormhole standard), while Omni Bridge-deployed tokens cap at 9

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Pull request overview

Updates the “Decimal Normalization” documentation to address review feedback by correcting token decimal examples and clarifying Solana-specific decimals.

Changes:

• Adjusted the decimals table (WETH Solana decimals + note, simplified wNEAR “capped” wording).
• Updated the “Dust Problem” example to describe wNEAR bridging NEAR → Ethereum and corrected the conversion math.

Comments suppressed due to low confidence (1)

docs/core-concepts/decimals.mdx:43

• This “Dust Problem” example doesn’t actually show rounding/dust: 0.0000001 wNEAR (10^17 in 24 decimals) converts exactly to 100000000000 in 18 decimals, so nothing “disappears during conversion.” Either adjust the example to use an amount that rounds down to 0 (or loses precision) when converting 24→18, or reword the surrounding text to match the fact that the failure here is purely due to fees/minimums rather than rounding.

```typescript
// wNEAR bridged to Ethereum: 24 decimals → 18 decimals
// On NEAR: 0.0000001 wNEAR = 100000000000000000 (24 decimals)
// Converted to Ethereum: 100000000000 (18 decimals) = 0.0000001 wNEAR
// If amount after fees is too small, transfer fails

This is called "dust" — amounts so small they disappear during conversion.

How the SDK Protects You

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