doc: use _Class Method_ in async_hooks.md

We use _Class Method_ rather than _static_ in documentation headers in
buffer.md and crypto.md.  We use _static_ in one place in
async_hooks.md. Change to _Class Method_ for consistency.

PR-URL: #34626
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

Author: Trott

doc/api/async_hooks.md

@@ -729,7 +729,7 @@ class DBQuery extends AsyncResource {
 }
 ```
 
-#### `static AsyncResource.bind(fn[, type])`
+#### Class Method: `AsyncResource.bind(fn[, type])`
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