fix null and doc

Author: millotp

templates/java/libraries/okhttp-gson/api.mustache

@@ -48,7 +48,7 @@ public class {{classname}} extends ApiClient {
 
     public {{classname}}(String appId, String apiKey, String region, ClientOptions options) {
       super(appId, apiKey, "{{{baseName}}}", "{{{packageVersion}}}", options);
-      if (options != null && options.getHosts() == null) {
+      if (options != null && options.getHosts() != null) {
         this.setHosts(options.getHosts());
       } else {
         this.setHosts(getDefaultHosts(region));

website/docs/clients/guides/customized-client-usage.mdx

@@ -97,7 +97,7 @@ import com.algolia.api.SearchClient;
 SearchClient client = new SearchClient(
   "<YOUR_APP_ID>", 
   "<YOUR_API_KEY>",
-  ClientOptions.build().addAlgoliaAgentSegments("my user agent", "optional version")
+  new ClientOptions().addAlgoliaAgentSegments("my user agent", "optional version")
 );
 ```
 
@@ -135,7 +135,7 @@ import com.algolia.api.SearchClient;
 SearchClient client = new SearchClient(
   "<YOUR_APP_ID>", 
   "<YOUR_API_KEY>",
-  ClientOptions.build().setRequester(new MyOwnRequester())
+  new ClientOptions().setRequester(new MyOwnRequester())
 );
 ```