MINOR: Update Protocol Buffers documentation URLs

[yhao3]

Updates outdated Protocol Buffers documentation URLs in Type.java and ByteUtils.java from code.google.com to the current protobuf.dev domain.

[Yunyung]

Thanks for the PR. Please also update the code comments in ByteUtils.java

[yhao3]

@Yunyung Thanks for the review! I've already included the ByteUtils.java updates in this PR.

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