Move CLOSE phaser to asychronous phasers section

Author: lizmat

doc/Language/phasers.pod6

@@ -248,10 +248,6 @@ treated as if declared at C<use> time in the using module. (It is erroneous to
 depend on this order if the module is used more than once, however, since the
 phasers are only installed the first time they're noticed.)
 
-=head2 X<CLOSE|Phasers, CLOSE>
-
-Appears in a supply block. Called when the supply is closed.
-
 =head1 Block phasers
 
 Execution in the context of a block has its own phases.
@@ -443,6 +439,10 @@ after the C<whenever> block it is placed within finishes.
 This phaser is similar to setting the C<quit> routine while tapping a Supply
 with C<tap>.
 
+=head2 X<CLOSE|Asynchronous Phasers, CLOSE>
+
+Appears in a supply block. Called when the supply is closed.
+
 =head1 DOC phasers
 
 =head2 X<DOC|Asynchronous Phasers, DOC>