Remove python3.7 reference from doc link (#39706)

Author: st81

src/transformers/hf_argparser.py

@@ -294,7 +294,7 @@ def parse_args_into_dataclasses(
         Parse command-line args into instances of the specified dataclass types.
 
         This relies on argparse's `ArgumentParser.parse_known_args`. See the doc at:
-        docs.python.org/3.7/library/argparse.html#argparse.ArgumentParser.parse_args
+        docs.python.org/3/library/argparse.html#argparse.ArgumentParser.parse_args
 
         Args:
             args: