Mark CouchbaseAnnotationProcessor for auto-discovery. (#1871)

Closes #1870

src/main/antora/modules/ROOT/pages/couchbase/repository.adoc

@@ -31,6 +31,51 @@ public class Config extends AbstractCouchbaseConfiguration {
 
 An advanced usage is described in <<couchbase.repository.multibucket>>.
 
+[[couchbase.repository.configuration.dsl]]
+=== QueryDSL Configuration
+Spring Data Couchbase supports QueryDSL for building type-safe queries. To enable code generation you need to set `spring-data-couchbase` as annotation processor on your project.
+
+.Maven Configuration Example
+====
+[source,xml]
+----
+<build>
+    <plugins>
+        <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-compiler-plugin</artifactId>
+            <version>[compiler-plugin-version]</version>
+            <configuration>
+                <annotationProcessorPaths>
+                    <!-- path to the annotation processor -->
+                    <path>
+                        <groupId>com.querydsl</groupId>
+                        <artifactId>querydsl-apt</artifactId>
+                        <version>[version]</version>
+                    </path>
+                    <path>
+                        <groupId>org.springframework.data</groupId>
+                        <artifactId>spring-data-couchbase</artifactId>
+                        <version>[version]</version>
+                    </path>
+                </annotationProcessorPaths>
+            </configuration>
+        </plugin>
+    </plugins>
+</build>
+
+----
+====
+
+.Gradle Configuration Example
+====
+[source,groovy]
+----
+annotationProcessor 'com.querydsl:querydsl-apt:${querydslVersion}'
+annotationProcessor 'org.springframework.data:spring-data-couchbase:${springDataCouchbaseVersion}'
+----
+====
+
 [[couchbase.repository.usage]]
 == Usage
 
@@ -361,7 +406,7 @@ public interface AirportRepository extends PagingAndSortingRepository<Airport, S
 ----
 ====
 
-[[dto-projections]]
+[[couchbase.repository.dto-projections]]
 === DTO Projections
 
 Spring Data Repositories usually return the domain model when using query methods.

src/main/resources/META-INF/services/javax.annotation.processing.Processor

@@ -0,0 +1 @@
+org.springframework.data.couchbase.repository.support.CouchbaseAnnotationProcessor