[Doc] Add --add-opens java.base/jdk.internal.misc=ALL-UNNAMED to the example execution.

Author: vyazelenko

README.md

@@ -62,7 +62,7 @@ Jars for the executable, source, and javadoc for the various modules can be foun
 
 An example to execute a Jar from command line using the 'all' jar which includes the Agrona dependency:
 
-    java -Dsbe.generate.ir=true -Dsbe.target.language=Cpp -Dsbe.target.namespace=sbe -Dsbe.output.dir=include/gen -Dsbe.errorLog=yes -jar sbe-all/build/libs/sbe-all-${SBE_TOOL_VERSION}.jar my-sbe-messages.xml
+    java --add-opens java.base/jdk.internal.misc=ALL-UNNAMED -Dsbe.generate.ir=true -Dsbe.target.language=Cpp -Dsbe.target.namespace=sbe -Dsbe.output.dir=include/gen -Dsbe.errorLog=yes -jar sbe-all/build/libs/sbe-all-${SBE_TOOL_VERSION}.jar my-sbe-messages.xml
 
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