Remove redundant brackets in signatures.

Doc/library/stdtypes.rst

@@ -457,7 +457,7 @@ Additional Methods on Integer Types
 
     .. versionadded:: 3.1
 
-    .. method:: int.to_bytes(length, byteorder, [\*, signed=False])
+    .. method:: int.to_bytes(length, byteorder, \*, signed=False)
 
     Return an array of bytes representing an integer.
 
@@ -489,7 +489,7 @@ Additional Methods on Integer Types
 
     .. versionadded:: 3.2
 
-    .. classmethod:: int.from_bytes(bytes, byteorder, [\*, signed=False]])
+    .. classmethod:: int.from_bytes(bytes, byteorder, \*, signed=False)
 
     Return the integer represented by the given array of bytes.