schema: ibm: systems: fix description

Replace 'devices' with 'systems' in the description of the
IBMCompatibleSystem schema.  Devices was left over from an earlier WIP
iteration of the schema with more generalized scope.

Change-Id: I904800c39eaa1f309124cfd3b3ef4e7cd0b11576
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/schemas/IBM.json b/schemas/IBM.json
index 0a35f23..6cad689 100644
--- a/schemas/IBM.json
+++ b/schemas/IBM.json
@@ -60,9 +60,9 @@
                 "entity with entries or configuration in a hardware database.",
                 "Strings appear in the list from most specific to most",
                 "general.  This allows an entity to express compatibility with",
-                "a family of similar devices, in turn allowing an application",
-                "to match a variety of devices with a single IBMCompatibleSystem",
-                "entry.",
+                "a family of similar systems, in turn allowing an application",
+                "to match a variety of systems with a single",
+                "IBMCompatibleSystem entry.",
                 "",
                 "The recommended entry format is 'manufacturer,model' where",
                 "the manufacturer is a string describing the name of the",