Update Marian config default vocabulary size (#19464)

* update marian default vocab size

* also update docstring

src/transformers/models/marian/configuration_marian.py

@@ -43,7 +43,7 @@ class MarianConfig(PretrainedConfig):
 
 
     Args:
-        vocab_size (`int`, *optional*, defaults to 50265):
+        vocab_size (`int`, *optional*, defaults to 58101):
             Vocabulary size of the Marian model. Defines the number of different tokens that can be represented by the
             `inputs_ids` passed when calling [`MarianModel`] or [`TFMarianModel`].
         d_model (`int`, *optional*, defaults to 1024):
@@ -110,7 +110,7 @@ class MarianConfig(PretrainedConfig):
 
     def __init__(
         self,
-        vocab_size=50265,
+        vocab_size=58101,
         decoder_vocab_size=None,
         max_position_embeddings=1024,
         encoder_layers=12,