Adds comment to kotlin-maven-plugin declaration

pom.xml

@@ -299,9 +299,18 @@
 		<pluginManagement>
 			<plugins>
 				<plugin>
+					<!-- Based on instructions here - https://kotlinlang.org/docs/reference/using-maven.html -->
 					<groupId>org.jetbrains.kotlin</groupId>
 					<artifactId>kotlin-maven-plugin</artifactId>
 					<version>${kotlin.version}</version>
+					<configuration>
+						<!-- https://github.com/spring-projects/spring-framework/blob/6.2.x/buildSrc/src/main/java/org/springframework/build/KotlinConventions.java#L38-L39 -->
+						<apiVersion>1.7</apiVersion>
+						<languageVersion>1.7</languageVersion>
+						<jvmTarget>17</jvmTarget>
+						<javaParameters>true</javaParameters>
+						<args>-Xjsr305=strict -opt-in=kotlin.RequiresOptIn</args>
+					</configuration>
 					<executions>
 						<execution>
 							<id>compile</id>
@@ -309,18 +318,24 @@
 								<goal>compile</goal>
 							</goals>
 							<configuration>
-								<!-- https://github.com/spring-projects/spring-framework/blob/6.2.x/buildSrc/src/main/java/org/springframework/build/KotlinConventions.java#L38-L39 -->
-								<apiVersion>1.7</apiVersion>
-								<languageVersion>1.7</languageVersion>
-								<jvmTarget>17</jvmTarget>
-								<javaParameters>true</javaParameters>
-								<args>-Xjsr305=strict -opt-in=kotlin.RequiresOptIn</args>
 								<sourceDirs>
 									<sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
 									<sourceDir>${project.basedir}/src/main/java</sourceDir>
 								</sourceDirs>
 							</configuration>
 						</execution>
+						<execution>
+							<id>test-compile</id>
+							<goals>
+								<goal>test-compile</goal>
+							</goals>
+							<configuration>
+								<sourceDirs>
+									<sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
+									<sourceDir>${project.basedir}/src/test/java</sourceDir>
+								</sourceDirs>
+							</configuration>
+						</execution>
 					</executions>
 				</plugin>
 				<plugin>