fix: clean up Will struct doc comments for balances/token fields

[Hu-ter]

Overview

This PR fixes the Will struct's documentation in contracts/will/src/types.rs. The balances and token fields currently carry stray, duplicated doc lines left over from before the multi-token (balances: Map<Address, i128>) refactor: balances incorrectly shows "The token contract (e.g. a USDC Stellar Asset Contract) held by the will.", and token incorrectly shows "The beneficiaries and their percentage shares. Always sums to 100." These leftovers are removed so each field's doc comment describes only that field.

Related Issue

Closes #

Changes

📝 Will Struct Doc Cleanup

• [MODIFY] contracts/will/src/types.rs

  • Removes the duplicated "The token contract (e.g. a USDC Stellar Asset Contract) held by the will." doc line from the balances field.
  • Removes the stray "The beneficiaries and their percentage shares. Always sums to 100." doc line from the token field.
  • Keeps each field's doc comment focused on that field only, matching the intended post-refactor documentation.

• [REVIEW] Rustdoc output for the Will struct

  • cargo doc --no-deps -p will confirms no other fields carry similarly misplaced comments.

Verification Results

cargo doc --no-deps -p will
✅ Will struct docs render without the stray lines

cargo test --workspace
✅ Passing

cargo clippy --all-targets -- -D warnings
✅ Passing

Acceptance Criteria	Status
Remove stray/duplicated doc lines from balances and token	✅ Removed; both fields now describe only themselves
Rustdoc output reviewed for other misplaced comments	✅ No other Will fields carry leftover/mismatched text
cargo test --workspace passes	✅ Passing in CI
cargo clippy --all-targets -- -D warnings passes	✅ Passing in CI

Closes #335

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