Polish "Document how to exclude an annotation processor with Maven"

See gh-22000

Author: snicoll

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix-configuration-metadata.adoc

@@ -708,6 +708,30 @@ With Maven the dependency should be declared as optional, as shown in the follow
 	</dependency>
 ----
 
+If you have defined `@ConfigurationProperties` in your application, make sure to configure the `spring-boot-maven-plugin` to prevent the `repackage` goal from adding the dependency into the fat jar:
+
+[source,xml,indent=0,subs="verbatim,quotes,attributes"]
+----
+	<project>
+		<build>
+			<plugins>
+				<plugin>
+					<groupId>org.springframework.boot</groupId>
+					<artifactId>spring-boot-maven-plugin</artifactId>
+					<configuration>
+						<excludes>
+							<exclude>
+								<groupId>org.springframework.boot</groupId>
+								<artifactId>spring-boot-configuration-processor</artifactId>
+							</exclude>
+						</excludes>
+					</configuration>
+				</plugin>
+			</plugins>
+		</build>
+	</project>
+----
+
 With Gradle 4.5 and earlier, the dependency should be declared in the `compileOnly` configuration, as shown in the following example:
 
 [source,groovy,indent=0,subs="verbatim,quotes,attributes"]

spring-boot-project/spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -7583,42 +7583,39 @@ If you do it that way, the library is not provided and, by default, Spring Boot
 
 Spring Boot uses an annotation processor to collect the conditions on auto-configurations in a metadata file (`META-INF/spring-autoconfigure-metadata.properties`).
 If that file is present, it is used to eagerly filter auto-configurations that do not match, which will improve startup time.
-It is recommended to add the following dependency in a module that contains auto-configurations and exclude it in the `spring-boot-maven-plugin` to prevent the repacking task from adding the dependency into the fat jar:
+It is recommended to add the following dependency in a module that contains auto-configurations:
+
+[source,xml,indent=0,subs="verbatim,quotes,attributes"]
+----
+	<dependency>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-autoconfigure-processor</artifactId>
+		<optional>true</optional>
+	</dependency>
+----
+
+If you have defined auto-configurations directly in your application, make sure to configure the `spring-boot-maven-plugin` to prevent the `repackage` goal from adding the dependency into the fat jar:
 
 [source,xml,indent=0,subs="verbatim,quotes,attributes"]
 ----
 	<project>
-    ...
-    <dependencies>
-      <dependency>
-        <groupId>org.springframework.boot</groupId>
-        <artifactId>spring-boot-autoconfigure-processor</artifactId>
-      </dependency>
-    </dependencies>
-    <build>
-      ...
-      <plugins>
-        ...
-        <plugin>
-          <groupId>org.springframework.boot</groupId>
-          <artifactId>spring-boot-maven-plugin</artifactId>
-          <configuration>
-            <excludes>
-              ...
-              <exclude>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-autoconfigure-processor</artifactId>
-              </exclude>
-            </excludes>
-          </configuration>
-          ...
-        </plugin>
-        ...
-      </plugins>
-      ...
-    </build>
-    ...
-  </project>
+		<build>
+			<plugins>
+				<plugin>
+					<groupId>org.springframework.boot</groupId>
+					<artifactId>spring-boot-maven-plugin</artifactId>
+					<configuration>
+						<excludes>
+							<exclude>
+								<groupId>org.springframework.boot</groupId>
+								<artifactId>spring-boot-autoconfigure-processor</artifactId>
+							</exclude>
+						</excludes>
+					</configuration>
+				</plugin>
+			</plugins>
+		</build>
+	</project>
 ----
 
 With Gradle 4.5 and earlier, the dependency should be declared in the `compileOnly` configuration, as shown in the following example: