fix(velocity): explicitly add the annotation processor in Maven (#709)

* fix(velocity): explicitly add the annotation processor in Maven

* fix: copy paste error

* fix: split Maven versions

Author: zlataovce

src/content/docs/velocity/dev/getting-started/creating-your-first-plugin.mdx

@@ -90,7 +90,49 @@ system's documentation ([Gradle](https://docs.gradle.org/current/userguide/userg
     }
     ```
   </TabItem>
-  <TabItem label="Maven">
+  <TabItem label="Maven 4+">
+    :::caution
+
+    If you're using JDK 23 or later, you must add the annotation processor manually to your `pom.xml`, as described in the example.
+    See the [Maven documentation](https://maven.apache.org/plugins/maven-compiler-plugin-4.x/examples/annotation-processor.html) for more information.
+
+    :::
+
+    ```xml title="pom.xml" replace
+    <project>
+      <repositories>
+        <repository>
+          <id>papermc</id>
+          <url>https://repo.papermc.io/repository/maven-public/</url>
+        </repository>
+      </repositories>
+
+      <dependencies>
+        <dependency>
+          <groupId>com.velocitypowered</groupId>
+          <artifactId>velocity-api</artifactId>
+          <version>\{LATEST_VELOCITY_RELEASE}</version>
+          <scope>provided</scope>
+        </dependency>
+        <!-- add the annotation processor -->
+        <dependency>
+          <groupId>com.velocitypowered</groupId>
+          <artifactId>velocity-api</artifactId>
+          <version>\{LATEST_VELOCITY_RELEASE}</version>
+          <type>processor</type>
+        </dependency>
+      </dependencies>
+    </project>
+    ```
+  </TabItem>
+  <TabItem label="Maven 3">
+    :::caution
+
+    If you're using JDK 23 or later, you must add the annotation processor manually to your `pom.xml`, as described in the example.
+    See the [Maven documentation](https://maven.apache.org/plugins/maven-compiler-plugin-4.x/examples/annotation-processor.html) for more information.
+
+    :::
+
     ```xml title="pom.xml" replace
     <project>
       <repositories>
@@ -108,6 +150,25 @@ system's documentation ([Gradle](https://docs.gradle.org/current/userguide/userg
           <scope>provided</scope>
         </dependency>
       </dependencies>
+
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-compiler-plugin</artifactId>
+            <configuration>
+              <!-- add the annotation processor -->
+              <annotationProcessorPaths>
+                <path>
+                  <groupId>com.velocitypowered</groupId>
+                  <artifactId>velocity-api</artifactId>
+                  <version>\{LATEST_VELOCITY_RELEASE}</version>
+                </path>
+              </annotationProcessorPaths>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
     </project>
     ```
   </TabItem>