fix little missunderstanding

[JamesHertz]

The documentation of Document.postDataCharset(String charset) says: "Sets the default post data character set for x-www-form-urlencoded post data."

At first I thought, it was not about the POST request but about the x-www-form-urlencoded data. Which means, that if I used this method sending a charset B as argument, even if I do a GET request the x-www-form-urlencoded data in it would've been converted into chartset B.

What is actually happening is that it's all about POST request and somehow it feels a bit weird. What is happening is that when it's a POST request Jsoup uses the charSet specified by postDataCharSet to transform the x-www-form-urlencoded data but for everything else it just uses a default charSet. The most funny thing is that the variable that postDataCharSet affects is initialized with this default charset.

I think that it would be better if Jsoup just used this value (specified using postDataCharSet) to transform x-www-form-urlencoded data, no matter the method used (as long as the method allows such kind of data).

I just changed two lines of code to make that happen.

I hope you reconsider this, it would make some people life easiser.