config-linux,schema: fix FileMode description

Originally, the file mode was indeed written in octal (see e.g.
commit 5273b3d), but it was found out later that JSON does not
allow octal values so the examples were changed to decimal in
commit ccf3a24, but the "typically an octal value" bit (added
by commit cdcabde) remains.

Change it to emphasize the fact that this is in decimal.

Also, add a note to config-linux.md saying the same thing.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

config-linux.md

@@ -135,7 +135,7 @@ Each entry has the following structure:
     If a [file][] already exists at `path` that does not match the requested device, the runtime MUST generate an error.
     The path MAY be anywhere in the container filesystem, notably outside of `/dev`.
 * **`major, minor`** *(int64, REQUIRED unless `type` is `p`)* - [major, minor numbers][devices] for the device.
-* **`fileMode`** *(uint32, OPTIONAL)* - file mode for the device.
+* **`fileMode`** *(uint32, OPTIONAL)* - file mode for the device. Note it is a decimal (not an octal) number.
     You can also control access to devices [with cgroups](#configLinuxDeviceAllowedlist).
 * **`uid`** *(uint32, OPTIONAL)* - id of device owner in the [container namespace](glossary.md#container-namespace).
 * **`gid`** *(uint32, OPTIONAL)* - id of device group in the [container namespace](glossary.md#container-namespace).

schema/defs-linux.json

@@ -149,7 +149,7 @@
             "$ref": "defs.json#/definitions/int64"
         },
         "FileMode": {
-            "description": "File permissions mode (typically an octal value)",
+            "description": "File permissions mode (in decimal, not octal)",
             "type": "integer",
             "minimum": 0,
             "maximum": 512