Teach jsonnet-lint about optional parameters of std.manifestYamlDoc

[swgillespie]

manifestYamlDoc takes two optional parameters, indent_array_in_object and quote_keys. This commit teaches jsonnet-lint about them so that it doesn't raise errors when you use them.

There are other stdlib library functions with this problem; the true solution is probably to auto-generate this from the stdlib AST, but this at least gets the linter happy with this particular function.

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[sparkprime]

There is also the documentation which exists as a jsonnet file and I believe lists the params.