Fix: use "doc" instead "pdf" dir and uniformize code

htdocs/admin/propal.php

...e/modules/project/doc/doc_generic_project_odt.modules.php

htdocs/core/modules/project/doc/index.html

htdocs/core/modules/project/doc/pdf_baleine.modules.php

...modules/project/task/doc/doc_generic_task_odt.modules.php

htdocs/core/modules/project/task/doc/index.html

htdocs/projet/admin/project.php

htdocs/projet/class/project.class.php

htdocs/projet/class/task.class.php

test/phpunit/BuildDocTest.php