Issue 1643: Properties and expressions in generator models documented (#1652)

plugins/org.yakindu.sct.doc.user/src/user-guide/generating_code_headless.textile

@@ -183,6 +183,11 @@ Use the <code>-m <em>models</em></code> option to select certain models known by
 *Default:* If the @-m@ option is not specified, this is equivalent to <code>-m <em>basedir</em></code>, i.e. all model files in and beneath _basedir_ are processed.
 
 
+h4(#hdls_specifying_property_values). Specifying property values
+
+Use the <code>-v <em>name1=value1;name2=value2;nameN=valueN</em></code> option to override properties _name1_, _name2_, _nameN_, specified in the generator models, by the given values _value1_, _value2_, and _valueN_, respectively. See section "&quot;Using properties and expressions in generator models&quot;":../user-guide/generating_code#codegen_using_properties_and_expressions_in_generator_models for details.
+
+
 
 
 h2(#hdls_troubleshooting). Troubleshooting