docs: biometrics plugin URL (#632)

Current path is `../biometrics`. I think the correct path should be  `../plugins/biometrics`

Author: Ombuweb

packages/fingerprint-auth/README.md

@@ -1,6 +1,6 @@
 ## Replacement notice
 
-This plugin is replaced by [@nativescript/biometrics](../biometrics)
+This plugin is replaced by [@nativescript/biometrics](../plugins/biometrics)
 
 # @nativescript/fingerprint-auth