tokenizer.save has the wrong arguments compared to documentation (#901)

* tokenizer.save has the wrong arguments compared to documentation

* Fixing doc of `save` function.

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

bindings/python/src/tokenizer.rs

@@ -604,7 +604,7 @@ impl PyTokenizer {
     ///     pretty (:obj:`bool`, defaults to :obj:`True`):
     ///         Whether the JSON file should be pretty formatted.
     #[args(pretty = true)]
-    #[text_signature = "(self, pretty=True)"]
+    #[text_signature = "(self, path, pretty=True)"]
     fn save(&self, path: &str, pretty: bool) -> PyResult<()> {
         ToPyResult(self.tokenizer.save(path, pretty)).into()
     }