Fix description of download commands in ServerInfo entity

The download commands are returned as a map and not as a list.

Change-Id: I6ded8914bbfc6362a4e7f103e245538fcf04938b
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/rest-api-config.txt b/Documentation/rest-api-config.txt
index b32f58e..0b8e2f8 100644
--- a/Documentation/rest-api-config.txt
+++ b/Documentation/rest-api-config.txt
@@ -1026,7 +1026,8 @@
 |`is_auth_supported` |not set if `false`|
 Whether this download scheme supports authentication.
 |`commands`          ||
-List of download commands, where  '${project}' is used as
+Download commands as a map which maps the command name to the download
+command. In the download command '${project}' is used as
 placeholder for the project name, and '${ref}' is used as
 placeholder for the (change) ref.