feat: update fork snapshot docs to use sdk examples

Author: designcode

docs/buckets/snapshots-and-forks.mdx

@@ -390,7 +390,7 @@ Example using the Tigris SDK for JavaScript:
 import { createBucket } from "@tigrisdata/storage";
 
 const result = await createBucket("forked-bucket", {
-  sourceBucketName: "PARENT_BUCKET_NAME", // source bucket name
+  sourceBucketName: "SOURCE_BUCKET_NAME", // source bucket name
   sourceBucketSnapshot: "SNAPSHOT_NAME", // optional snapshot name
 });