add docs

Signed-off-by: Victor Vieux <vieux@docker.com>

docs/sources/reference/api/docker_remote_api.md

@@ -49,8 +49,9 @@ You can still call an old version of the API using
 `GET /info`
 
 **New!**
-`info` now returns the number of CPUs available on the machine (`NCPU`) and
-total memory available (`MemTotal`).
+`info` now returns the number of CPUs available on the machine (`NCPU`),
+total memory available (`MemTotal`), the short hostname (`Hostname`). and
+the ID (`ID`).
 
 `POST /containers/create`
 

docs/sources/reference/api/docker_remote_api_v1.16.md

@@ -1220,6 +1220,8 @@ Display system-wide information
              "KernelVersion":"3.12.0-1-amd64"
              "NCPU":1,
              "MemTotal":2099236864,
+             "Hostname":"prod-server-42",
+             "ID":"7TRN:IPZB:QYBB:VPBQ:UMPP:KARE:6ZNR:XE6T:7EWV:PKF4:ZOJD:TPYS"
              "Debug":false,
              "NFd": 11,
              "NGoroutines":21,

docs/sources/reference/commandline/cli.md

@@ -856,6 +856,8 @@ For example:
     Kernel Version: 3.13.0-24-generic
     Operating System: Ubuntu 14.04 LTS
     CPUs: 1
+    Hostname: prod-server-42
+    ID: 7TRN:IPZB:QYBB:VPBQ:UMPP:KARE:6ZNR:XE6T:7EWV:PKF4:ZOJD:TPYS
     Total Memory: 2 GiB
     Debug mode (server): false
     Debug mode (client): true