fix sign tool arg (#987)

src/main.ts

@@ -117,7 +117,7 @@ module.exports = function (argv: string[]): void {
 		.option('--allow-star-activation', 'Allow using * in activation events')
 		.option('--allow-missing-repository', 'Allow missing a repository URL in package.json')
 		.option('--skip-license', 'Allow packaging without license file')
-		.option('--sign-tool', 'Path to the VSIX signing tool. Will be invoked with two arguments: `SIGNTOOL <path/to/extension.signature.manifest> <path/to/extension.signature.p7s>`.')
+		.option('--sign-tool <path>', 'Path to the VSIX signing tool. Will be invoked with two arguments: `SIGNTOOL <path/to/extension.signature.manifest> <path/to/extension.signature.p7s>`.')
 		.action(
 			(
 				version,
@@ -198,7 +198,7 @@ module.exports = function (argv: string[]): void {
 		.option('--no-update-package-json', 'Do not update `package.json`. Valid only when [version] is provided.')
 		.option('-i, --packagePath <paths...>', 'Publish the provided VSIX packages.')
 		.option('--sigzipPath <paths...>', 'Signature archives to publish alongside the VSIX packages.')
-		.option('--sign-tool', 'Path to the VSIX signing tool. Will be invoked with two arguments: `SIGNTOOL <path/to/extension.signature.manifest> <path/to/extension.signature.p7s>`. This will be ignored if --sigzipPath is provided.')
+		.option('--sign-tool <path>', 'Path to the VSIX signing tool. Will be invoked with two arguments: `SIGNTOOL <path/to/extension.signature.manifest> <path/to/extension.signature.p7s>`. This will be ignored if --sigzipPath is provided.')
 		.option(
 			'--githubBranch <branch>',
 			'The GitHub branch used to infer relative links in README.md. Can be overridden by --baseContentUrl and --baseImagesUrl.'