universal_map_index::UniversalMapIndex does not exist; the on-disk
variant is on_disk_map_index::OnDiskMapIndex (the third MapIndex
variant). Repointed the three rustdoc links accordingly.
tools/coverage.sh was split into tools/unit-test-coverage.sh and
tools/integration-test-coverage.sh in #6414, but DEVELOPMENT.md still
pointed at the old path and the new script's own usage header kept the
old name. Updated both to the unit-test script.
- 'mising' -> 'missing' in .github/review-rules.md (flagged by the
repo's own codespell config)
- 'Do not create segments larger this size' -> 'larger than this size'
in config.yaml, the optimizer builder/diff sources and the grpc
proto + generated rust comment
- 'bigger then' -> 'bigger than' in the query scorer rustdoc
- three duplicated-word rustdoc fixes ('override in in', 'any of of',
'and and')
陈志谦