Adopt weaker wording for non-normative note

adoc/extensions/sycl_khr_work_item_queries.adoc

@@ -8,9 +8,9 @@ device.
 
 {note} Passing such instances as arguments can result in a clearer interface
 that is less error-prone to use.
-For example, if a function accepts a [code]#sycl::group#, the caller must assume
-that function may call a [code]#sycl::group_barrier# and ensure that associated
-control flow requirements are satisfied.
+For example, when a function takes an argument of type [code]#sycl::group#, it
+is an indication that the function may synchronize all work-items in that group
+by calling [code]#sycl::group_barrier#.
 It is recommended that this extension is used only when modifying existing
 interfaces is not feasible.
 {endnote}