Clarifies why all suppliers being done triggers done

Author: MorayJ

doc/Type/Supply.pod6

@@ -59,7 +59,7 @@ Creates a new tap (a kind of subscription if you will), in addition to all
 existing taps. The first positional argument is a piece of code that will be
 called when a new value becomes available through the C<emit> call.
 
-The C<&done> callback can be called in a number of cases: if a supply block is being tapped, when a C<done> routine is reached; if a supply block is being tapped, it will be automatically triggered if the supply block reaches the end; if the C<&done> method is called on the parent C<Supplier> (in the case of a supply block, if there are multiple Suppliers referenced by C<whenever>, they must all have their C<done> method invoked for this to trigger the C<&done> callback of the tap).
+The C<&done> callback can be called in a number of cases: if a supply block is being tapped, when a C<done> routine is reached; if a supply block is being tapped, it will be automatically triggered if the supply block reaches the end; if the C<done> method is called on the parent C<Supplier> (in the case of a supply block, if there are multiple Suppliers referenced by C<whenever>, they must all have their C<done> method invoked for this to trigger the C<&done> callback of the tap as the block will then reach its end).
 
 The C<&quit> callback is called if the tap is on a supply block which exits with an error. It is also called if the C<quit> method is invoked on the parent C<Supplier> (in the case of a supply block any one C<Supplier> quitting with an uncaught exception will call the C<&quit> callback as the block will exit with an error).