Describe the bug

Since the last update (gh version 2.30.0 (2023-05-30)), the autocomplete for extensions produces weird result, it "autocompletes" the description of the extension, too.

Steps to reproduce the behavior

1. Install an extension (eg. gh extension install cli/gh-webhook)
2. Type gh web hit <tab>
3. See error

Expected vs actual behavior

Expected:

$ gh webhook

Actual:

$ gh webhook  (Extension cli/gh-webhook)

Misc

Tested on macOS and on Ubuntu from official repo, with various extensions installed. The problem appeared in all cases.