Replace `jp` with `jr` where appropriate
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- Dominant language
- Assembly
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Description
Several places in the tutorial still use `jp` (absolute jump) where `jr` (relative jump) would be more appropriate and cycle-efficient. jr is properly explained and introduced in [Part I - Jumps](https://gbdev.io/gb-asm-tutorial/part1/jumps.html), so from that point onward it should be safe to replace jp with jr wherever the target label is within the 128 bytes range.
Work has already started on this (#146), but some occurrences remain.
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