Gérer les projets de documentation multilingues DITA XML: proofreading

- fix lists to illustrate directory structure
- remove :file: directive for DITAMAP file types (not a proper file)
- replace text by Prerequisite rubric
- rework list punctuation
- indent example and step result on step
- set text status as reviewed

Signed-off-by: Olivier Carrère <carrereo@gmail.com>
Acked-by: Angela Cristina <acristina@redaction-technique.org>