Correct search version in README (#10722)

Author: sima-zhu

sdk/search/azure-search-documents/README.md

@@ -16,7 +16,7 @@ create and manage indexes, load data, implement search features, execute queries
 <dependency>
     <groupId>com.azure</groupId>
     <artifactId>azure-search-documents</artifactId>
-    <version>1.0.0-beta.2</version>
+    <version>1.0.0-beta.3</version>
 </dependency>
 ```
 [//]: # ({x-version-update-end})