Issue checkstyle#15089: note for windows users on system property syntax

src/xdocs/cmdline.xml.vm

@@ -148,7 +148,10 @@ java -D<property>=<value>  \
         option has been dropped for Checkstyle 5.0, because of significant changes regarding
         package name file handling. See <a href="config.html#Packages">this link</a> for details.
       </p>
-
+      <p>
+        To define system property for execution look at
+        <a href="config_system_properties.html#Properties">system properties</a>.
+      </p>
       <p>
         Set the properties for <a href="config.html#Properties">expanded
         property values</a> by either by assigning system properties using the

src/xdocs/config_system_properties.xml

@@ -16,6 +16,17 @@
       </macro>
     </section>
 
+    <section name="How to set system property for CLI">
+      <p>
+        System properties should be provided to <code>java</code> command.
+        Example: <code>java -D&lt;property&gt;=&lt;value&gt; -jar ... </code>
+      </p>
+      <p>
+        Attention to Windows users: system properties should be wrapped with <code>"</code>.
+        Example: <code>-D"&lt;property&gt;=&lt;value&gt;"</code>
+      </p>
+    </section>
+
     <section name="Enable External DTD load">
       <p>
         The property <code>checkstyle.enableExternalDtdLoad</code>
@@ -119,6 +130,10 @@ Audit done.
 Checkstyle ends with 2 errors.
           </source>
         </p>
+        <p>
+          Attention to Windows users: system properties should be wrapped with <code>"</code>.
+          Example: <code>-D"&lt;property&gt;=&lt;value&gt;"</code>
+        </p>
       </subsection>
     </section>