A typo on CommandLineTool Specification: stdin example

Hello,

Happens to find a typo on 5.1.8 stdin of the documents: {} should be () in order for the example to work.

stdin: ${inputs.an_input_name.path}

Regards

Thank you @green555 ; I’ve submitted a fix for CWL v1.2.1: https://github.com/common-workflow-language/cwl-v1.2/pull/244