Update ERC-7821: fix typo (tranaction -> transaction)

[0xAxiom]

Fixes a single-character typo in the Motivation section of ERC-7821 (Draft).

Change

- Using atomic batched executions reduces total latency and total tranaction costs, making it preferable over sequential transaction sending for EOAs.
+ Using atomic batched executions reduces total latency and total transaction costs, making it preferable over sequential transaction sending for EOAs.

Notes

• File: ERCS/erc-7821.md line 26
• Status: Draft (editable per EIP-1 process)
• Pure string-only edit (no semantic change)
• Verified non-overlap: open PRs Update ERC-7821: Remove Call Struct from Specification #883, Update ERC-7821: Adds missing _execute call in reference implementation #829 touch ERC-7821 but for substantive changes (Call Struct removal, missing _execute call), not typos
• Commit GPG-signed with RSA 7C3D4BFE44B598C90CE31DCCA190D7A3B1700D63

[eip-review-bot]

File ERCS/erc-7821.md

Requires 1 more reviewers from @Amxx, @jxom, @Vectorized