f1f994a122b135160216b6fc56c095b83eeaf812 doc: Add `guix` prefix for changes to reproducible builds (Hennadii Stepanov)
Pull request description:
Most of contributors already use the `guix:` prefix for changes to `contrib/guix`. Also `guix` is shorter than `build`, and it is more focused/specific.
ACKs for top commit:
fanquake:
ACK f1f994a122b135160216b6fc56c095b83eeaf812
Tree-SHA512: 3f754e80802ec4e871b099ce1f0877e34ecc4816fbe9c49bfd2a7368ef79fed9edf6c65f38eedef2a87367fdc911dc548e0def422d80b66a91ce2e5f35826032