further pom cleanup

pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
     <artifactId>parent-modules</artifactId>
@@ -118,9 +117,7 @@
         <module>lombok</module>
         <!-- <module>kotlin</module> -->
         <module>mapstruct</module>
-	<!--
-        <module>metrics</module>
-        -->
+        <!-- <module>metrics</module> -->
         <module>mesos-marathon</module>
         <module>testing-modules/mockito</module>
         <module>testing-modules/mockito-2</module>
@@ -146,14 +143,13 @@
         <module>resteasy</module>
         <module>rxjava</module>
         <module>spring-swagger-codegen</module>
-
         <module>testing-modules/selenium-junit-testng</module>
         <module>persistence-modules/solr</module>
         <module>spark-java</module>
-      <!--  <module>spring-5</module>-->
+        <module>spring-5</module>
         <module>spring-5-reactive</module>
         <module>spring-5-mvc</module>
-        <module>spring-5-security</module>
+        <!-- <module>spring-5-security</module> --> <!-- TODO: uncomment -->
         <module>spring-activiti</module>
         <module>spring-akka</module>
         <module>spring-amqp</module>