Precedence is different in code vs docs

[joemalle]

In the code, it seems like and has a higher priority than or: https://github.com/beltoforion/muparser/blob/master/include/muParserDef.h#L208

But in the docs, it seems to be the other way around: https://beltoforion.de/en/muparser/features.php#idDef2

Would be great to fix the docs

[beltoforion]

I will fix the documentation.

[beltoforion]

documentation fixed