GetCanonicalizedResource should not have a .ToLower

With a .ToLower at the end of GetCanonicalizedResource the sample code does not work for addresses that have uppercase characters. Per the documentation, only parameter names (and not values) should be lowercase.

Search the repository for GetCanonicalizedResource and inspect how its canonicalized resource string is built. Compare the implementation with the linked documentation, then verify with an uppercase address that parameter names are normalized while parameter values retain their case.

Written by the indexing model from the issue text.