Add placement snippets for docs.

Objective-C/advanced/APIDemo/APIDemo/Snippets/AdPlacementsSnippets.m

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+//
+//  Copyright (C) 2025 Google, Inc.
+//
+//  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
+//
+//      http://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.
+//
+
+#import <Foundation/Foundation.h>
+#import <GoogleMobileAds/GoogleMobileAds.h>
+
+// Replace with your own placement ID.
+static long adPlacementID = 2500718471;
+static NSString *const adUnitID = @"ca-app-pub-3940256099942544/4411468910";
+
+@interface AdPlacementsSnippets : UIViewController
+
+@end
+
+@interface AdPlacementsSnippets ()
+- (void)loadInterstitial;
+- (void)showBannerView:(GADBannerView *)bannerView;
+- (void)showAd:(GADInterstitialAd *)ad;
+- (void)configureView:(GADNativeAdView *)nativeAdView withNativeAd:(GADNativeAd *)nativeAd;
+@end
+
+@implementation AdPlacementsSnippets
+
+// [START load_interstitial]
+- (void)loadInterstitial {
+  GADRequest *request = [GADRequest request];
+  request.placementID = adPlacementID;
+  [GADInterstitialAd loadWithAdUnitID:adUnitID
+                              request:request
+                    completionHandler:^(GADInterstitialAd *ad, NSError *error) {
+                      if (!error) {
+                        NSLog(@"Placement ID: %lld", ad.placementID);
+                        return;
+                      }
+                    }];
+}
+// [END load_interstitial]
+
+// [START show_banner]
+- (void)showBannerView:(GADBannerView *)bannerView {
+  bannerView.placementID = adPlacementID;
+  [self.view addSubview:bannerView];
+}
+// [END show_banner]
+
+// [START show_interstitial]
+- (void)showAd:(GADInterstitialAd *)ad {
+  ad.placementID = adPlacementID;
+  [ad presentFromRootViewController:self];
+}
+// [END show_interstitial]
+
+// [START show_native]
+- (void)configureView:(GADNativeAdView *)nativeAdView withNativeAd:(GADNativeAd *)nativeAd {
+  nativeAd.placementID = adPlacementID;
+  nativeAdView.nativeAd = nativeAd;
+}
+// [END show_native]
+
+@end

Swift/advanced/APIDemo/APIDemo/Snippets/AdPlacementsSnippets.swift

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+//
+//  Copyright (C) 2025 Google, Inc.
+//
+//  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
+//
+//      http://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.
+//
+
+import GoogleMobileAds
+
+private class AdPlacementsSnippets: UIViewController {
+
+  // Replace with your own placement ID.
+  private let adPlacementID: Int64 = 2500718471
+  private let adUnitID = "ca-app-pub-3940256099942544/6978759866"
+
+  // [START load_interstitial]
+  private func loadInterstitial() async {
+    do {
+      let interstitial = try await InterstitialAd.load(
+        with: adUnitID, request: Request())
+      interstitial.placementID = adPlacementID
+      print("Placement ID set to: \(interstitial.placementID)")
+    } catch {
+      print("Failed to load interstitial ad with error: \(error.localizedDescription)")
+    }
+  }
+  // [END load_interstitial]
+
+  // [START show_banner]
+  private func showBanner(_ bannerView: BannerView) {
+    bannerView.placementID = adPlacementID
+    view.addSubview(bannerView)
+  }
+  // [END show_banner]
+
+  // [START show_interstitial]
+  private func showInterstitial(_ ad: InterstitialAd) {
+    ad.placementID = adPlacementID
+    ad.present(from: self)
+  }
+  // [END show_interstitial]
+
+  // [START show_native]
+  private func configureView(_ nativeAdView: NativeAdView, withAd nativeAd: NativeAd) {
+    nativeAd.placementID = adPlacementID
+    nativeAdView.nativeAd = nativeAd
+  }
+  // [END show_native]
+}