docs: improve description for internal presets (#16338)

lib/config/presets/__snapshots__/index.spec.ts.snap

lib/config/presets/index.spec.ts

lib/config/presets/internal/compatibility.ts

lib/config/presets/internal/config.ts

lib/config/presets/internal/default.ts

lib/config/presets/internal/docker.ts

lib/config/presets/internal/group.ts

lib/config/presets/internal/helpers.ts

lib/config/presets/internal/npm.ts

lib/config/presets/internal/packages.ts

lib/config/presets/internal/preview.ts

lib/config/presets/internal/regex-managers.ts

lib/config/presets/internal/replacements.ts

lib/config/presets/internal/schedule.ts

lib/config/presets/internal/workarounds.ts