Fix otlpreceiver README (was incorrect about bytes being base64 encoded) #3123
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The comment was about traceid/spanid "bytes" fields. This comment is incorrect since
we have changed traceid/spanid fields to use hex encoding (as required by the spec).
In the future if we add any other "bytes" fields to the proto they will be encoded as base64
as it is expected and is default behavior of Protobuf/JSON, but this does not require an
explicit comment, so I am deleting it.