Remote API docs give incorrect example for creating a container with volumes.

This fix tries to address the issue mentioned in Docker Remote API where
the examples for creating a container (`POST /containers/create`) with
volumes were incorrect. In the previous remote API document, the `Mounts`
fields was used for volume creation yet since v1.20 `Volumes` should be
used.

This fix fixes #21335.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

docs/reference/api/docker_remote_api_v1.20.md

@@ -154,14 +154,9 @@ Create a container
                    "com.example.license": "GPL",
                    "com.example.version": "1.0"
            },
-           "Mounts": [
+           "Volumes": {
-             {
+             "/volumes/data": {}
-               "Source": "/data",
-               "Destination": "/data",
-               "Mode": "ro,Z",
-               "RW": false
            }
-           ],
            "WorkingDir": "",
            "NetworkDisabled": false,
            "MacAddress": "12:34:56:78:9a:bc",
@@ -245,7 +240,8 @@ Json Parameters:
 -   **Entrypoint** - Set the entry point for the container as a string or an array
       of strings.
 -   **Image** - A string specifying the image name to use for the container.
--   **Mounts** - An array of mount points in the container.
+-   **Volumes** - An object mapping mount point paths (strings) inside the
+      container to empty objects.
 -   **WorkingDir** - A string specifying the working directory for commands to
       run in.
 -   **NetworkDisabled** - Boolean value, when true disables networking for the

docs/reference/api/docker_remote_api_v1.21.md

@@ -158,14 +158,9 @@ Create a container
                    "com.example.license": "GPL",
                    "com.example.version": "1.0"
            },
-           "Mounts": [
+           "Volumes": {
-             {
+             "/volumes/data": {}
-               "Source": "/data",
-               "Destination": "/data",
-               "Mode": "ro,Z",
-               "RW": false
            }
-           ],
            "WorkingDir": "",
            "NetworkDisabled": false,
            "MacAddress": "12:34:56:78:9a:bc",
@@ -256,7 +251,8 @@ Json Parameters:
 -   **Entrypoint** - Set the entry point for the container as a string or an array
       of strings.
 -   **Image** - A string specifying the image name to use for the container.
--   **Mounts** - An array of mount points in the container.
+-   **Volumes** - An object mapping mount point paths (strings) inside the
+      container to empty objects.
 -   **WorkingDir** - A string specifying the working directory for commands to
       run in.
 -   **NetworkDisabled** - Boolean value, when true disables networking for the

docs/reference/api/docker_remote_api_v1.22.md

@@ -246,17 +246,6 @@ Create a container
                    "com.example.license": "GPL",
                    "com.example.version": "1.0"
            },
-           "Mounts": [
-             {
-               "Name": "fac362...80535",
-               "Source": "/data",
-               "Destination": "/data",
-               "Driver": "local",
-               "Mode": "ro,Z",
-               "RW": false,
-               "Propagation": ""
-             }
-           ],
            "Volumes": {
              "/volumes/data": {}
            }
@@ -366,7 +355,8 @@ Json Parameters:
 -   **Entrypoint** - Set the entry point for the container as a string or an array
       of strings.
 -   **Image** - A string specifying the image name to use for the container.
--   **Mounts** - An array of mount points in the container.
+-   **Volumes** - An object mapping mount point paths (strings) inside the
+      container to empty objects.
 -   **WorkingDir** - A string specifying the working directory for commands to
       run in.
 -   **NetworkDisabled** - Boolean value, when true disables networking for the

docs/reference/api/docker_remote_api_v1.23.md

@@ -265,17 +265,6 @@ Create a container
                    "com.example.license": "GPL",
                    "com.example.version": "1.0"
            },
-           "Mounts": [
-             {
-               "Name": "fac362...80535",
-               "Source": "/data",
-               "Destination": "/data",
-               "Driver": "local",
-               "Mode": "ro,Z",
-               "RW": false,
-               "Propagation": ""
-             }
-           ],
            "Volumes": {
              "/volumes/data": {}
            }
@@ -386,7 +375,8 @@ Json Parameters:
 -   **Entrypoint** - Set the entry point for the container as a string or an array
       of strings.
 -   **Image** - A string specifying the image name to use for the container.
--   **Mounts** - An array of mount points in the container.
+-   **Volumes** - An object mapping mount point paths (strings) inside the
+      container to empty objects.
 -   **WorkingDir** - A string specifying the working directory for commands to
       run in.
 -   **NetworkDisabled** - Boolean value, when true disables networking for the

docs/reference/api/docker_remote_api_v1.24.md

@@ -265,17 +265,6 @@ Create a container
                    "com.example.license": "GPL",
                    "com.example.version": "1.0"
            },
-           "Mounts": [
-             {
-               "Name": "fac362...80535",
-               "Source": "/data",
-               "Destination": "/data",
-               "Driver": "local",
-               "Mode": "ro,Z",
-               "RW": false,
-               "Propagation": ""
-             }
-           ],
            "Volumes": {
              "/volumes/data": {}
            }
@@ -387,7 +376,8 @@ Json Parameters:
 -   **Entrypoint** - Set the entry point for the container as a string or an array
       of strings.
 -   **Image** - A string specifying the image name to use for the container.
--   **Mounts** - An array of mount points in the container.
+-   **Volumes** - An object mapping mount point paths (strings) inside the
+      container to empty objects.
 -   **WorkingDir** - A string specifying the working directory for commands to
       run in.
 -   **NetworkDisabled** - Boolean value, when true disables networking for the