Remove bogus :expires param from squish. nine++

Author: Jan-Olof Hendig

doc/Type/Supply.pod6

@@ -520,12 +520,10 @@ a value to have been seen, even if it's the same as an old value.
 
 =head2 method squish
 
-    method squish(Supply:D: :$as, :$with, :$expires --> Supply:D)
+    method squish(Supply:D: :$as, :$with --> Supply:D)
 
 Creates a supply that only provides unique values, as defined by the optional
-:as and :with parameters (same as with List.squish).  The optional :expires
-parameter how long to wait (in seconds) before "resetting" and not considering
-a value to have been seen, even if it's the same as an old value.
+:as and :with parameters (same as with List.squish).
 
 =head2 method max