Remove extra "d" in comment (#40212)

Super simple typo fix :)

examples/cms-sanity/lib/sanity.server.js

@@ -12,7 +12,7 @@ export const previewClient = createClient({
   ...sanityConfig,
   useCdn: false,
   // Fallback to using the WRITE token until https://www.sanity.io/docs/vercel-integration starts shipping a READ token.
-  // As this client only exists on the server and the token is never shared with the browser, we ddon't risk escalating permissions to untrustworthy users
+  // As this client only exists on the server and the token is never shared with the browser, we don't risk escalating permissions to untrustworthy users
   token:
     process.env.SANITY_API_READ_TOKEN || process.env.SANITY_API_WRITE_TOKEN,
 })