Merge pull request #32 from common-workflow-language/CommandLineTool.arguments_doc_clarification

CommandLineTool.arguments doc clarification

Author: mr-c

CommandLineTool.yml

@@ -78,6 +78,7 @@ $graph:
         * Clarify behavior of `glob` for absolute paths and symlinks.
         * Clarify behavior of `glob` to include directories.
         * `secondaryFiles` can now be explicitly marked as `required` or not.
+        * Clarify CommandLineTool.arguments documentation
 
       See also the [CWL Workflow Description, v1.1.0-dev1 changelog](Workflow.html#Changelog).
 
@@ -639,7 +640,10 @@ $graph:
         "_container": "@list"
     - name: arguments
       doc: |
-        Command line bindings which are not directly associated with input parameters.
+        Command line bindings which are not directly associated with input
+        parameters. If the value is a string, it is used as a string literal
+        argument. If it is an Expression, the result of the evaluation is used
+        as an argument.
       type:
         - "null"
         - type: array