Add step to AF3 FMU export

Issue-Ref: 4031
Issue-Url: https://af3-developer.fortiss.org/issues/4031



Signed-off-by: Tiziano Munaro <munaro@fortiss.org>

org.fortiss.af3.rcp.help/html/.ratings

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org.fortiss.af3.rcp.help/html/example_co-simulation.html

@@ -80,6 +80,7 @@
 					<h3>AutoFOCUS 3</h3>
 
 						<ol>
+							<li>Create a folder within the AF3 workspace. FMUs cannot be exported to the workspace's root folder.</li>
 							<li>Export the <b>Input</b> component as FMU: <b>'[Right-click on component] &rarr; Export to FMU 2.0'</b></li>
 							<li>Set the component to be executed at a frequency of <b>100 Hz</b> and store it in the root folder of your workspace.</li>
 						</ol>