Add comments to explain what the formatter.js file does

[PaulRBerg]

It's not immediately obvious what this code does:

docs/formatter.js

Lines 3 to 10 in 1c7d804

	async function formatGasBenchmark() {
	const filePath = 'docs/contracts/v2/05-gas-benchmarks.md';
	const markdownContent = await fs.readFile(filePath, 'utf8');
	const formattedContent = markdownContent.replace(/\b\d+\b/g, (match) => {
	return parseInt(match).toLocaleString('en-US');
	});
	await fs.writeFile(filePath, formattedContent);
	}