Tweak docs on Maven resource filtering some more

spring-boot-docs/src/main/asciidoc/production-ready-features.adoc

@@ -208,19 +208,8 @@ configuration instead. This is possible in both Maven and Gradle.
 [[production-ready-application-info-automatic-expansion-maven]]
 ===== Automatic property expansion using Maven
 You can automatically expand info properties from the Maven project using resource
-filtering. In your `pom.xml` you have (inside the `<build/>` element):
-
-[source,xml,indent=0]
-----
-    <resources>
-        <resource>
-            <directory>src/main/resources</directory>
-            <filtering>true</filtering>
-        </resource>
-    </resources>
-----
-
-You can then refer to your Maven '`project properties`' via placeholders, e.g.
+filtering. If you use the `spring-boot-starter-parent` you can then refer to your 
+Maven '`project properties`' via `@..@` placeholders, e.g.
 
 [source,properties,indent=0]
 ----
@@ -229,15 +218,41 @@ You can then refer to your Maven '`project properties`' via placeholders, e.g.
 	project.version=X.X.X.X
 	project.description=Demo project for info endpoint
 	info.build.artifact=${project.artifactId}
-	info.build.name=${project.name}
-	info.build.description=${project.description}
-	info.build.version=${project.version}
+	info.build.name=@project.name@
+	info.build.description=@project.description@
+	info.build.version=@project.version@
 ----
 
 NOTE: In the above example we used `+project.*+` to set some values to be used as
 fallbacks if the Maven resource filtering has not been switched on for some reason.
 
+NOTE: If you don't use the starter parent, in your `pom.xml` you need (inside the `<build/>` element):
 
+[source,xml,indent=0]
+----
+    <resources>
+        <resource>
+            <directory>src/main/resources</directory>
+            <filtering>true</filtering>
+        </resource>
+    </resources>
+----
+
+and (inside `<plugins/>`):
+
+[source,xml,indent=0]
+----
+				<plugin>
+					<groupId>org.apache.maven.plugins</groupId>
+					<artifactId>maven-resources-plugin</artifactId>
+					<version>2.6</version>
+					<configuration>
+						<delimiters>
+							<delimiter>@</delimiter>
+						</delimiters>
+					</configuration>
+				</plugin>
+----
 
 [[production-ready-application-info-automatic-expansion-gradle]]
 ===== Automatic property expansion using Gradle