JAVA-33: Added comments in pom.xml with reason to not upgrade to boot-2

jhipster/pom.xml

@@ -9,6 +9,8 @@
     <packaging>pom</packaging>
 
     <parent>
+    <!-- Jhipster project is autogenerated and upgrading it will need a newly generated project. 
+        Also, we already have jhipster-5 which has new version of boot-2. So, this project should be left as a legacy version. -->
         <artifactId>parent-boot-1</artifactId>
         <groupId>com.baeldung</groupId>
         <version>0.0.1-SNAPSHOT</version>

spring-4/pom.xml

@@ -8,6 +8,7 @@
     <packaging>jar</packaging>
 
     <parent>
+    <!-- this module uses legacy Spring features, so can't upgrade to boot-2 -->
         <groupId>com.baeldung</groupId>
         <artifactId>parent-boot-1</artifactId>
         <version>0.0.1-SNAPSHOT</version>

spring-activiti/pom.xml

@@ -8,6 +8,7 @@
     <description>Demo project for Spring Boot</description>
 
     <parent>
+    <!-- This module uses Activiti version 6.0.0 with support for Spring Boot 1. Upgrade to Boot 2 should be clubbed with upgrade to Activiti 7 -->
         <groupId>com.baeldung</groupId>
         <artifactId>parent-boot-1</artifactId>
         <version>0.0.1-SNAPSHOT</version>

spring-boot-modules/spring-boot-1/pom.xml

@@ -7,6 +7,7 @@
     <description>Module for Spring Boot version 1.x</description>
 
     <parent>
+    <!-- This module contains article about Spring Boot Actuator in Spring Boot version 1.x -->
         <groupId>com.baeldung</groupId>
         <artifactId>parent-boot-1</artifactId>
         <version>0.0.1-SNAPSHOT</version>

spring-remoting/remoting-hessian-burlap/pom.xml

@@ -9,6 +9,7 @@
     <packaging>pom</packaging>
 
     <parent>
+    <!-- uses legacy spring, cannot upgrade to boot-2 -->
         <groupId>com.baeldung</groupId>
         <artifactId>parent-boot-1</artifactId>
         <version>0.0.1-SNAPSHOT</version>