All logs Builders (LogExporterBuilder/MetricExporterBuilder/SpanExporterBuilder) are unreachable from the docs and unnamable

[elichai]

As you can see, it's not possible to see in the docs what can be done with the builder: https://docs.rs/opentelemetry-otlp/latest/opentelemetry_otlp/struct.SpanExporter.html#method.builder.
it also means that user code cannot name the builder, meaning it cannot return it from functions, put it into types, etc.