build: fix broken API check (#28098)

Fixes that the API golden check is currently failing.

Author: crisbeto

tools/public_api_guard/material/autocomplete.md

@@ -190,7 +190,7 @@ export class MatAutocompleteTrigger implements ControlValueAccessor, AfterViewIn
     // (undocumented)
     _handleKeydown(event: KeyboardEvent): void;
     // (undocumented)
-    static ngAcceptInputType_autocompleteDisabled: unknown;
+    static ngAcceptInputType_autocompleteDisabled: unknown /** Handles keyboard events coming from the overlay panel. */;
     // (undocumented)
     ngAfterViewInit(): void;
     // (undocumented)