fa0fee44a8 ci: Remove redundant busybox option (MarcoFalke)
fa102ec69f doc: Shorten ci name (MarcoFalke)
2222223780 doc: Remove bash -c wrapper (MarcoFalke)
Pull request description:
The option was fine, but now that there is a dedicated Alpine Linux task, which uses BusyBox, it seems redundant.
(See: `ci/test/00_setup_env_native_alpine_musl.sh`)
So remove the `USE_BUSY_BOX` option, along with the `BINS_SCRATCH_DIR` env var.
Also includes two small ci-doc fixups.
ACKs for top commit:
fanquake:
ACK fa0fee44a8
Tree-SHA512: abad7888cbf5833cc322d133187f74653c232c03b8949ad06dd1ea5ace14127871322fe682268ebec7720963615c3f113c7660a2055bf48bbb9ff9a730221d7e