Example page for access header worker has invalid syntax

[rbuzzell]

Existing documentation URL(s)

• https://developers.cloudflare.com/cloudflare-one/tutorials/access-workers/

What changes are you suggesting?

• Issue: The example code in step 5 provides a syntax error when actually attempted.
  • Seems to be unhappy with a : in the async, fetch, Promise line.
• Why: example code should be functional.
• Expected outcome: Example code runs when copied verbatim.

Additional information

[ranbel]

Hi @vicb, there appears to be a typo in #17905. Would you mind checking the code syntax?

[vicb]

This is Typescript rather than JS.
I'll update to show both.