chore: code coverage

Author: fugerit79

fj-doc-freemarker/src/test/resources/fj_doc_test/freemarker-doc-process_alt.xml

@@ -26,6 +26,7 @@
 			<function name="messageFormat" value="org.fugerit.java.doc.freemarker.fun.SimpleMessageFun"/>
 			<function name="sumLong" value="org.fugerit.java.doc.freemarker.fun.SimpleSumLongFun"/>
 			<function name="base64ToString" value="org.fugerit.java.doc.freemarker.fun.Base64ToStringFun"/>
+            <function name="stringToBase64" value="org.fugerit.java.doc.freemarker.fun.StringToBase64Fun"/>
 		</chainStep>
 	</docChain>