Use a more appropriate tense

Author: stoned

doc/Type/Supply.pod6

@@ -378,7 +378,7 @@ a final batch when the supply is done.
 B<Note>: Since Rakudo version 2020.12, the C<:seconds> parameter has
 a millisecond granularity: for example a 1 millisecond duration could
 be specified as C<:seconds(0.001)>. Before Rakudo version 2020.12,
-the C<:seconds> parameter has a second granularity.
+the C<:seconds> parameter had a second granularity.
 
 =head2 method elems