Hello. I was pokinf around in the Python 3.0b2 interpreter and I found
some typos in the following doctring:

>>> import sys; print(sys.platform.__doc__)
str(string[, encoding[, errors]]) -> str

Create a new string object from the given encoded string.
encoding defaults to the current default string encoding.
errors can be 'strict', 'replace' or 'ignore' and defaults to 'strict'.



Please fix the docstring words 'encoding' and 'errors' to have the
capital initial letter, so that the docstring would look like this:
str(string[, encoding[, errors]]) -> str

Create a new string object from the given encoded string.
Encoding defaults to the current default string encoding.
Errors can be 'strict', 'replace' or 'ignore' and defaults to 'strict'.



Please fix other similar typos if you find them. Thank you.