Fix two tiny typos in `pipelines/base.py::Pipeline::_sanitize_parameters()`'s docstring (#29102)

* Update base.py

* Fix a typo

src/transformers/pipelines/base.py

@@ -1048,9 +1048,9 @@ class Pipeline(_ScikitCompat):
     def _sanitize_parameters(self, **pipeline_parameters):
         """
         _sanitize_parameters will be called with any excessive named arguments from either `__init__` or `__call__`
-        methods. It should return 3 dictionnaries of the resolved parameters used by the various `preprocess`,
-        `forward` and `postprocess` methods. Do not fill dictionnaries if the caller didn't specify a kwargs. This
-        let's you keep defaults in function signatures, which is more "natural".
+        methods. It should return 3 dictionaries of the resolved parameters used by the various `preprocess`,
+        `forward` and `postprocess` methods. Do not fill dictionaries if the caller didn't specify a kwargs. This
+        lets you keep defaults in function signatures, which is more "natural".
 
         It is not meant to be called directly, it will be automatically called and the final parameters resolved by
         `__init__` and `__call__`

src/transformers/pipelines/conversational.py

@@ -272,7 +272,7 @@ class ConversationalPipeline(Pipeline):
                 Conversation to generate responses for. Inputs can also be passed as a list of dictionaries with `role`
                 and `content` keys - in this case, they will be converted to `Conversation` objects automatically.
                 Multiple conversations in either format may be passed as a list.
-            clean_up_tokenization_spaces (`bool`, *optional*, defaults to `False`):
+            clean_up_tokenization_spaces (`bool`, *optional*, defaults to `True`):
                 Whether or not to clean up the potential extra spaces in the text output.
             generate_kwargs:
                 Additional keyword arguments to pass along to the generate method of the model (see the generate method

src/transformers/pipelines/text_generation.py

@@ -204,7 +204,7 @@ class TextGenerationPipeline(Pipeline):
             return_full_text (`bool`, *optional*, defaults to `True`):
                 If set to `False` only added text is returned, otherwise the full text is returned. Only meaningful if
                 *return_text* is set to True.
-            clean_up_tokenization_spaces (`bool`, *optional*, defaults to `False`):
+            clean_up_tokenization_spaces (`bool`, *optional*, defaults to `True`):
                 Whether or not to clean up the potential extra spaces in the text output.
             prefix (`str`, *optional*):
                 Prefix added to prompt.