chore: Clean up contract

[clabby]

Overview

Small changes to RISCV.sol for ethereum-optimism/optimism#12994. Mainly syntax changes to pass semgrep and some doc comments.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 61.89%. Comparing base (df0d2cc) to head (9246665).

Files with missing lines	Patch %	Lines
rvgo/bindings/riscv.go	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
- Coverage   62.10%   61.89%   -0.22%     
==========================================
  Files          27       27              
  Lines        4077     4091      +14     
==========================================
  Hits         2532     2532              
- Misses       1413     1427      +14     
  Partials      132      132              

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