Fix document typos

Change the `State` field of the `/containers/json` remote API response to lowercase.
This change involves docs/api/v1.23.md and docs/api/v1.24.md

Signed-off-by: Anran Qiao <anran.qiao@daocloud.io>

docs/api/v1.23.md

@@ -53,7 +53,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 1",
                  "Created": 1367854155,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports": [{"PrivatePort": 2222, "PublicPort": 3333, "Type": "tcp"}],
                  "Labels": {
@@ -103,7 +103,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 222222",
                  "Created": 1367854155,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports": [],
                  "Labels": {},
@@ -139,7 +139,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 3333333333333333",
                  "Created": 1367854154,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports":[],
                  "Labels": {},
@@ -175,7 +175,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 444444444444444444444444444444444",
                  "Created": 1367854152,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports": [],
                  "Labels": {},

docs/api/v1.24.md

@@ -61,7 +61,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 1",
                  "Created": 1367854155,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports": [{"PrivatePort": 2222, "PublicPort": 3333, "Type": "tcp"}],
                  "Labels": {
@@ -111,7 +111,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 222222",
                  "Created": 1367854155,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports": [],
                  "Labels": {},
@@ -147,7 +147,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 3333333333333333",
                  "Created": 1367854154,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports":[],
                  "Labels": {},
@@ -183,7 +183,7 @@ List containers
                  "ImageID": "d74508fb6632491cea586a1fd7d748dfc5274cd6fdfedee309ecdcbc2bf5cb82",
                  "Command": "echo 444444444444444444444444444444444",
                  "Created": 1367854152,
-                 "State": "Exited",
+                 "State": "exited",
                  "Status": "Exit 0",
                  "Ports": [],
                  "Labels": {},