Rewording of If-Match werk

Change-Id: If93658ad625c63966fcf37fac9d09ca1e1a494a5

.werks/16136

@@ -9,14 +9,10 @@ Level: 1
 State: unknown
 Version: 2.2.0p11
 
-We recently made changes to make it possible to provide the following header
-in rest-api requests
-
-"If-Match": "*"
-
-instead of providing a resource's ETag.
-
-This werk adds a short explanation to the api-docs so that our users know
-that this is possible.
 
+Most PUT requests to the REST API require an If-Match header containing
+an ETag. With this Werk we make it possible to provide "*" instead of an
+ETag, like this: "If-Match": "*"
 
+This Werk also adds a short explanation to the REST API documentation.
+See the section "Updating values" for more information.