clarify workers to limit cores

Author: maettu

doc/Type/Iterable.pod6

@@ -90,7 +90,7 @@ where items are processed in parallel and the output order does not matter.
 =head3 Options degree and batch
 
 The C<degree> option (short for "degree of parallelism") configures how many parallel workers
-should be started. To limit the processing to 4 cores, pass C<:4degree> to the C<hyper> or
+should be started. To start 4 workers (e.g. to use at most 4 cores), pass C<:4degree> to the C<hyper> or
 C<race> method. Note that in some cases, choosing a degree higher than the available CPU cores
 can make sense, for example I/O bound work or latency-heavy tasks like web crawling. For
 CPU-bound work, however, it makes no sense to pick a number higher than the CPU core count.