hash -> encrypt (#10647)

Co-authored-by: Sarah Rainsberger <[email protected]>

src/content/docs/en/guides/server-islands.mdx

@@ -97,7 +97,7 @@ const productId = url.searchParams.get('product');
 
 ## Reusing the encryption key
 
-Astro uses [cryptography](https://developer.mozilla.org/en-US/docs/Glossary/Cryptography) to hash props passed to server islands to prevent accidentally leaking secrets. The props are hashed using a key that is generated during the build.
+Astro uses [cryptography](https://developer.mozilla.org/en-US/docs/Glossary/Cryptography) to encrypt props passed to server islands to prevent accidentally leaking secrets. The props are encrypted using a key that is generated during the build.
 
 For most hosts, this happens transparently and there is nothing that you as a developer need to do. If you are using rolling deployments in an environment such as Kubernetes, you may run into issues where the frontend and backend are temporarily out of sync and the keys don't match.