Overhaul reference documentation for RestClient

Reorder "Calling REST services" documentation and add a new section
covering `RestClient`.

See gh-36213

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/restclient/Details.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.restclient;
+
+public class Details {
+
+}

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/restclient/MyService.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.restclient;
+
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestClient;
+
+@Service
+public class MyService {
+
+	private final RestClient restClient;
+
+	public MyService(RestClient.Builder restClientBuilder) {
+		this.restClient = restClientBuilder.baseUrl("https://example.org").build();
+	}
+
+	public Details someRestCall(String name) {
+		return this.restClient.get().uri("/{name}/details", name).retrieve().body(Details.class);
+	}
+
+}

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/restclient/Details.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.restclient
+
+class Details

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/restclient/MyService.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.restclient
+
+import org.springframework.boot.docs.io.restclient.restclient.ssl.Details
+import org.springframework.stereotype.Service
+import org.springframework.web.client.RestClient
+
+@Service
+class MyService(restClientBuilder: RestClient.Builder) {
+
+	private val restClient: RestClient
+
+	init {
+		restClient = restClientBuilder.baseUrl("https://example.org").build()
+	}
+
+	fun someRestCall(name: String?): Details {
+		return restClient.get().uri("/{name}/details", name)
+				.retrieve().body(Details::class.java)!!
+	}
+
+}
+