Add missing source files

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>

en/includes/cmd-config-section-all.txt

+Everything below this line in this section is selectively included
+from the linkgit:git-config[1] documentation. The content is the same
+as what's found there:

en/includes/cmd-config-section-rest.txt

+Everything above this line in this section isn't included from the
+linkgit:git-config[1] documentation. The content that follows is the
+same as what's found there: