Update parameters.md

[propenster]

Line 101 should be request.AddParameter("foo", "bar", ParameterType.QueryString);

Not RequestType.QueryString that it was before.

It's just a typo, the AddParameter method in RestRequest does not have a "RequestType" param.

Thank you.

Description

Purpose

This pull request is a:

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)