Review comments.

Author: jglick

Jenkinsfile

@@ -1 +1 @@
-buildPlugin()
+buildPlugin(jenkinsVersions: [null, '2.121.1'])

src/main/resources/org/jenkinsci/plugins/workflow/steps/durable_task/DurableTaskStep/help-encoding.html

@@ -2,7 +2,11 @@
     Encoding of process output.
     In the case of <code>returnStdout</code>, applies to the return value of this step;
     otherwise, or always for standard error, controls how text is copied to the build log.
-    If unspecified, uses the system default encoding of the node on which the step is run,
-    but if there is any expectation that process output might include non-ASCII characters,
+    If unspecified, uses the system default encoding of the node on which the step is run.
+    If there is any expectation that process output might include non-ASCII characters,
     it is best to specify the encoding explicitly.
+    For example, if you have specific knowledge that a given process is going to be producing UTF-8
+    yet will be running on a node with a different system encoding
+    (typically Windows, since every Linux distribution has defaulted to UTF-8 for a long time),
+    you can ensure correct output by specifying: <code>encoding: 'UTF-8'</code>
 </div>