Allow_redirection parameter is misleading

[hernandik]

I spend sometime trying to disable "allow_redirection" of my POSTs requests, until I identify only one place where it as clear that I had to use '${False}' instead o 'False'. So I decide to create a simple fix in that documentation, to help other not to get caught on the same problems that I did. Below the fix suggestion.
#359

[lucagiove]

Thank you! Have you reviewed all the keywords to see whether documentation always use ${False/True} instead of the python syntax False/True?