sed : modifiez votre texte sans ouvrir vos fichiers: text

- proofread
- rework text after test on OpenSuse 13.1 (scripts were initially developed on
  Debian testing)

Signed-off-by: Olivier Carrère <carrereo@gmail.com>
Acked-by: Angela Cristina <acristina@redaction-technique.org>
sed : modifiez votre texte sans ouvrir vos fichiers: code

- rework code after test on OpenSuse 13.1 (scripts were initially developed on
  Debian testing)

Signed-off-by: Olivier Carrère <carrereo@gmail.com>
Acked-by: Angela Cristina <acristina@redaction-technique.org>
sed : modifiez votre texte sans ouvrir vos fichiers: indentation

Fix text and code indentation.

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