doc: reserve string/value
@@ -1132,6 +1132,12 @@ description= to not avoid metakeys with standard user keys, no metakey name must
[system]
description= to not avoid metakeys with standard system keys, no metakey name must begin with system
+[string]
+description= needed for formatting strings in error messages: %string% should refer to the string of the key, not to metadata "string"
+
+[value]
+description= needed for formatting values in error messages: %value% should refer to the value of the key, not to metadata "value"
+
