update: generate docs examples as per latest 1.8.x source.

docs/examples/1.8.x/server-kotlin/java/databases/update-string-attribute.md

@@ -0,0 +1,29 @@
+import io.appwrite.Client;
+import io.appwrite.coroutines.CoroutineCallback;
+import io.appwrite.services.Databases;
+
+Client client = new Client()
+    .setEndpoint("https://<REGION>.cloud.appwrite.io/v1") // Your API Endpoint
+    .setProject("<YOUR_PROJECT_ID>") // Your project ID
+    .setKey("<YOUR_API_KEY>"); // Your secret API key
+
+Databases databases = new Databases(client);
+
+databases.updateStringAttribute(
+    "<DATABASE_ID>", // databaseId
+    "<COLLECTION_ID>", // collectionId
+    "", // key
+    false, // required
+    "<DEFAULT>", // default
+    1, // size (optional)
+    "", // newKey (optional)
+    new CoroutineCallback<>((result, error) -> {
+        if (error != null) {
+            error.printStackTrace();
+            return;
+        }
+
+        System.out.println(result);
+    })
+);
+