Update core.d.ts

Use hash for class method member reference

Co-authored-by: Sindre Sorhus <[email protected]>

core.d.ts

@@ -119,7 +119,7 @@ A custom detector is a function that allows specifying custom detection mechanis
 An array of detectors can be provided via the `fileTypeOptions` argument for the `FileTypeParser` constructor.
 In Node.js, you should use `NodeFileTypeParser`, which extends `FileTypeParser` and provides access to Node.js specific functions.
 
-Detectors can be added via the constructor options, or by adding it directly to `FileTypeParser.detectors`.
+Detectors can be added via the constructor options, or by adding it directly to `FileTypeParser#detectors`.
 
 The detectors provided via the constructor options, are called before the default detectors are called.