docs: add example for decode_length_delimiter
#1311
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From documentation, it's not obvious how to decode the delimiter given the larger buffer. I think it would be helpful if there was an example.
Looking through the issues (e.g. #285), I found out that using
Bytes
orBytesMut
instead of&[u8]
makes everything work.I pieced this example from what I could find in the issues, so let me know if this is not the most idiomatic way and I will update the PR.