Fix add field method in SQL walkthrough
diff --git a/website/www/site/content/en/documentation/dsls/sql/walkthrough.md b/website/www/site/content/en/documentation/dsls/sql/walkthrough.md
index a02e14c..59ecb82 100644
--- a/website/www/site/content/en/documentation/dsls/sql/walkthrough.md
+++ b/website/www/site/content/en/documentation/dsls/sql/walkthrough.md
@@ -129,7 +129,7 @@
           .builder()
           .addInt32Field("appId")
           .addInt32Field("reviewerId")
-          .withFloatField("rating")
+          .addFloatField("rating")
           .addDateTimeField("rowtime")
           .build();