fix await claiming it returns a list of promises

Author: timo

doc/Type/Promise.pod6

@@ -292,8 +292,8 @@ or C<quit> with the C<cause> if the L<Promise> is Broken.
 
 Waits until one or more promises are I<all> fulfilled, and then returns their
 values. Also works on L<channels|/type/Channel>. Any broken promises will
-rethrow their exceptions. If a list of promises is provided a list of promises
-is returned.
+rethrow their exceptions. If a list is passed it will return a
+list containing the results of awaiting each item in turn.
 
 =end pod