vscode/extensions/markdown/markdown.configuration.json

{
	"comments": {
		// symbol used for single line comment. Remove this entry if your language does not support line comments
		"lineComment": "//",
		// symbols used for start and end a block comment. Remove this entry if your language does not support block comments
		"blockComment": [
			"/*",
			"*/"
		]
	},
	// symbols used as brackets
	"brackets": [
		[
			"{",
			"}"
		],
		[
			"[",
			"]"
		],
		[
			"(",
			")"
		]
	]
}