Add missing XML comment on parameter.

Author: rkeithhill

src/PowerShellEditorServices/Debugging/StackFrameDetails.cs

@@ -110,6 +110,10 @@ public class StackFrameDetails
         /// <param name="localVariables">
         /// A variable container with all the local variables for this stack frame.
         /// </param>
+        /// <param name="workspaceRootPath">
+        /// Specifies the path to the root of an open workspace, if one is open. This path is used to
+        /// determine whether individua stack frames are external to the workspace.
+        /// </param>
         /// <returns>A new instance of the StackFrameDetails class.</returns>
         static internal StackFrameDetails Create(
             PSObject callStackFrameObject,