[docs] possible bug in regular expression documentation

[Bart Aelterman]

Dear,

While reading the python documentation, chapter 7.2 "Regular expression
operations", I noticed a sentence that could be experienced as confusing:

"
\d
When the UNICODE flag is not specified, matches any decimal digit; this is
equivalent to the set [0-9]. With UNICODE, it will match whatever is
classified as a decimal digit in the Unicode character properties database.
"

I have a problem with "decimal digit". These patterns match only one
character. Therefore, one character can never be decimal, as that would
imply the presence of at least one digit and a decimal character (dot). I
would propose to delete the word "decimal". \d matches a digit.
Unless you want to say that \d+ matches a decimal digit, for instance
"2.2". But when I try that in ipython, \d+ only matches "2".

I hope my comment was helpful!

Thanks for all the great efforts!

Bart
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