docs: hacking: document string concatenations
Recommend GString for generic strings and virBuffer for strings that need helpers for other uses, like XML or command line formatting. Signed-off-by: NJán Tomko <jtomko@redhat.com> Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com> Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
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