schema: slight clarification for oci-layout file

opencontainers/image-spec#579 (comment)

Signed-off-by: Vincent Batts <[email protected]>

Author: tomalopbsr0tt

schema/image-layout-schema.json

@@ -1,11 +1,11 @@
 {
   "description": "OpenContainer Image Layout Schema",
   "$schema": "http://json-schema.org/draft-04/schema#",
-  "id": "https://opencontainers.org/schema/image-layout",
+  "id": "https://opencontainers.org/schema/image/layout",
   "type": "object",
   "properties": {
     "imageLayoutVersion": {
-      "description": "version of the OCI image-layout",
+      "description": "version of the OCI Image Layout (in the oci-layout file)",
       "type": "string",
       "enum": [
         "1.0.0"