Add docs to default build

Add spring-boot-docs to the default profile so that imports by default
into eclipse.

pom.xml

@@ -72,6 +72,7 @@
 				<module>spring-boot</module>
 				<module>spring-boot-autoconfigure</module>
 				<module>spring-boot-actuator</module>
+				<module>spring-boot-docs</module>
 				<module>spring-boot-starters</module>
 				<module>spring-boot-cli</module>
 			</modules>