refine wording

Author: cyyeh

packages/doc/docs/deployment/flydotio.mdx

@@ -66,7 +66,7 @@ successfully logged in as xxxxx@xxx
 
 For more detailed introduction on how to sign in, you can [read more here](https://fly.io/docs/hands-on/sign-in/).
 
-## Step 3: Packaging your VulcanSQL project
+## Step 3: Package your VulcanSQL project
 
 In this guide, we'll deploy the Docker version of your VulcanSQL project. So please execute the following command in the terminal: