str, bytes, bytearray docstring: remove unnecessary [...]

Objects/bytearrayobject.c

@@ -2465,7 +2465,7 @@ bytearray_rstrip(PyByteArrayObject *self, PyObject *args)
 }
 
 PyDoc_STRVAR(decode_doc,
-"B.decode([encoding='utf-8'[, errors='strict']]) -> str\n\
+"B.decode(encoding='utf-8', errors='strict') -> str\n\
 \n\
 Decode B using the codec registered for encoding. Default encoding\n\
 is 'utf-8'. errors may be given to set a different error\n\

Objects/bytesobject.c

@@ -2289,7 +2289,7 @@ bytes_endswith(PyBytesObject *self, PyObject *args)
 
 
 PyDoc_STRVAR(decode__doc__,
-"B.decode([encoding='utf-8'[, errors='strict']]) -> str\n\
+"B.decode(encoding='utf-8', errors='strict') -> str\n\
 \n\
 Decode B using the codec registered for encoding. Default encoding\n\
 is 'utf-8'. errors may be given to set a different error\n\

Objects/unicodeobject.c

@@ -7393,7 +7393,7 @@ unicode_count(PyUnicodeObject *self, PyObject *args)
 }
 
 PyDoc_STRVAR(encode__doc__,
-             "S.encode([encoding='utf-8'[, errors='strict']]) -> bytes\n\
+             "S.encode(encoding='utf-8', errors='strict') -> bytes\n\
 \n\
 Encode S using the codec registered for encoding. Default encoding\n\
 is 'utf-8'. errors may be given to set a different error\n\