[w3c/webpayments-method-identifiers] Add ignore example (#37)

With regards to... 

> User agents MUST NOT enforce validity or well-formedness of...

@zkoch wrote: 

> This seems a bit confusing to me at first read. All we're trying to say is "methods either match (great) or they don't (ignored)." It took me a bit to understand what this meant. Example might help?

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https://github.com/w3c/webpayments-method-identifiers/issues/37