New overload for Doc.GroupWithId()

[shocklateboy92]

csharpier/Src/CSharpier/DocTypes/Doc.cs

Line 84 in 7ed2638

public static Group GroupWithId(string groupId, params Doc[] contents)

should probably have another overload that takes a List<Doc>
so that we don't have instances like this:

csharpier/Src/CSharpier/SyntaxPrinter/SyntaxNodePrinters/Parameter.cs

Line 37 in 5583107

return Doc.Concat(Doc.GroupWithId(groupId, docs.ToArray()));

where we convert a List into an Array and back into a List in the Group() constructor.