Documentation for nodejs getMetadata doesn't indicate all options

[tejohnso]

Looking for example at getMetadata there's an indication that userProject can be supplied as an option, but there's no indication that we can include any key and it is going to be passed to the underlying request package as part of the qs (querystring) configuration for the request.

So while getMetadata({userProject: true}) might work, getMetadata({fields: "generation"}) also works. This is a minor issue, but it would be nice if it was more clear that what we're really passing as configuration is any querystring value that should be included. Curious to know why userProject is singled out there.

Also, as an aside, the documentation indicates userProject is a boolean.

[stephenplusplus]

This issue was moved to googleapis/nodejs-storage#77