CONTRIBUTING.md and the Makefile HEADER advertised nonexistent targets
(make clippy, make check) and claimed 'make pre-commit' runs
format + clippy + check + test, while .config/make/pre-commit.mak
actually runs fmt-check + guard scripts + quick-check with no clippy
and no tests. CONTRIBUTING.md also claimed the repository ships an
automated pre-commit git hook, but no hook is versioned.
- Replace phantom targets with the real ones (clippy-check,
quick-check, compilation-check)
- Document exactly what pre-commit and pre-pr run, gate by gate,
with an explicit note that pre-commit runs no clippy and no tests
- Point contributors to 'make pre-pr' as the full pre-PR gate
- Rewrite the git-hooks section to say hooks are optional and not
versioned; setup-hooks only marks an existing hook executable
No make targets were added or changed; docs/help truth only.
Refs: rustfs/backlog#1153 (infra-9), rustfs/backlog#1155
Zhengchao An