Revert "Disconnected javadoc plugin from Kotlin module"

This reverts commit baf7e5fa5b.

spring-cloud-function-kotlin/pom.xml

@@ -35,15 +35,9 @@
 			<optional>true</optional>
 		</dependency>
 	</dependencies>
+
 	<build>
 		<plugins>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-javadoc-plugin</artifactId>
-				<configuration>
-					<skip>true</skip>
-				</configuration>
-			</plugin>
 			<plugin>
 				<artifactId>kotlin-maven-plugin</artifactId>
 				<groupId>org.jetbrains.kotlin</groupId>