Modify subtitle a bit

Brock Wilcox · Brock Wilcox · commit 118835a87dec · 2015-12-24T02:23:17.000-05:00
diff --git a/doc/Language/phasers.pod b/doc/Language/phasers.pod
@@ -2,7 +2,7 @@
 
 =TITLE Phasers
 
-=SUBTITLE Execution phases
+=SUBTITLE Program execution phases and corresponding phaser blocks
 
 The lifetime (execution timeline) of a program is broken up into phases. A
 I<phaser> is a block of code called during a specific execution phase.
