Record compat for authenticatorAttachment on PublicKeyCredential.

The TypeScript types are inconsistent with what Firefox is shipping: #73 (comment)

Author: lgarron

compat.md

@@ -7,6 +7,7 @@ A document to track more specific nuances than <https://caniuse.com/?search=weba
 |-|-|-|-|-|
 | `PublicKeyCredential.isConditionalMediationAvailable()` | [spec](https://w3c.github.io/webauthn/#dom-publickeycredential-isconditionalmediationavailable), [crbug](https://bugs.chromium.org/p/chromium/issues/detail?id=1330946) | 🏁 106.0.5220.0+[^1] | ❌ | ✅ 16+ |
 | `largeBlob` extension | [spec](https://w3c.github.io/webauthn/#sctn-large-blob-extension), [crbug](https://bugs.chromium.org/p/chromium/issues/detail?id=1114875&colspec=ID%20Pri%20M%20Status%20Owner%20Summary%20OS%20Modified&x=m&y=releaseblock&cells=tiles&q=largeBlob&can=1), [chromestatus](https://chromestatus.com/feature/5657899357437952) | 🏁[^2][^3] | ❌[^4] | ❌[^4] |
+| `authenticatorAttachment` on `PublicKeyCredential` | [spec](https://w3c.github.io/webauthn/#dom-publickeycredential-authenticatorattachment) | ✅ 109.0.5414.87 | ❌ 111.0a1 | ✅ 16.2 |
 
 [^1]: Flag: `chrome://flags/#webauthn-conditional-ui`
 [^2]: Flag: `chrome://flags/#enable-experimental-web-platform-features`