Updates to examples

Author: duncanpo

examples/context_propagation/README.md

@@ -11,7 +11,7 @@ In this example, a C++ client calls a MATLAB function hosted on MATLAB Productio
    The built examples can be found in build/examples/context_propagation and subdirectories.
 2. [Create](https://www.mathworks.com/help/mps/server/creating-a-server.html) and [start](https://www.mathworks.com/help/mps/qs/starting-and-stopping.html) a MATLAB Production Server instance.
 3. [Deploy](https://www.mathworks.com/help/mps/qs/share-a-ctf-archive-on-the-server-instance.html) archive to server instance by copying to the auto_deploy directory.
-4. [Copy](https://www.mathworks.com/help/mps/server/use-web-handler-for-custom-routes-and-custom-payloads.html) matlab/routes.json to the config directory of the server instance.
+4. If using a MATLAB release before R2023b, [copy](https://www.mathworks.com/help/mps/server/use-web-handler-for-custom-routes-and-custom-payloads.html) matlab/routes.json to the config directory of the server instance. 
 6. Start an instance of [OpenTelemetry Collector](https://github.com/open-telemetry/opentelemetry-collector).
 7. Start the C++ client.
    ```

examples/context_propagation/matlab/mymagic.m

@@ -17,7 +17,7 @@
 sp = startSpan(tr, "mymagic", "SpanKind", "server");
 
 sz = double(request.Body);
-magicsquare = magic(request.Body);  % generate the magic square
+magicsquare = magic(sz);  % generate the magic square
 setAttributes(sp, "input", sz, "output", magicsquare);
 
 % convert magic square to char
@@ -48,7 +48,7 @@
 setTextMapPropagator(prop);
 end
 
-% Thie helper ensures the input function is only run once
+% This helper ensures the input function is only run once
 function runOnce(fh)
 persistent hasrun
 if isempty(hasrun)