quick fix SummarizationPipeline error messages (#14618)

* quick fix SummarizationPipeline error messages

Fix error messages to avoid spam errors, and errors of type:
`Your max_length is set to 50, but you input_length is only 46. You might consider decreasing max_length manually, e.g. summarizer('...', max_length=50)`

* correcto SummarizationPipeline error messages fixes

src/transformers/pipelines/text2text_generation.py

@@ -227,16 +227,13 @@ class SummarizationPipeline(Text2TextGenerationPipeline):
         """
         Checks whether there might be something wrong with given input with regard to the model.
         """
-        if input_length < min_length // 2:
-            logger.warning(
-                f"Your min_length is set to {min_length}, but you input_length is only {input_length}. You might "
-                "consider decreasing min_length manually, e.g. summarizer('...', min_length=10)"
-            )
+        if max_length < min_length:
+            logger.warning(f"Your min_length={min_length} must be inferior than your max_length={max_length}.")
 
         if input_length < max_length:
             logger.warning(
                 f"Your max_length is set to {max_length}, but you input_length is only {input_length}. You might "
-                "consider decreasing max_length manually, e.g. summarizer('...', max_length=50)"
+                f"consider decreasing max_length manually, e.g. summarizer('...', max_length={input_length//2})"
             )