Extends abbreviations for clarity

I've never seen ALAP before. Though can work it out, seems easier to be clear.

Also extended NYI to Not yet implemented

Author: MorayJ

doc/Language/phasers.pod6

@@ -24,10 +24,10 @@ C<Failure> or exception in the process.
 Here is a summary:
 
 =begin code :skip-test
-  BEGIN {...} #  * at compile time, ASAP, only ever runs once
-  CHECK {...} #  * at compile time, ALAP, only ever runs once
-   INIT {...} #  * at runtime, ASAP, only ever runs once
-    END {...} #  at runtime, ALAP, only ever runs once
+  BEGIN {...} #  * at compile time, as soon as possible, only ever runs once
+  CHECK {...} #  * at compile time, as late as possible, only ever runs once
+   INIT {...} #  * at runtime, as soon as possible, only ever runs once
+    END {...} #  at runtime, as late as possible, only ever runs once
     DOC [BEGIN|CHECK|INIT] {...} # only in documentation mode
 
   ENTER {...} #  * at every block entry time, repeats on loop blocks.
@@ -48,7 +48,7 @@ CONTROL {...} #  catch control exceptions, before LEAVE
    LAST {...} #  supply tapped by whenever-block is done, runs very last
    QUIT {...} #  catch async exceptions within a whenever-block, runs very last
 
-COMPOSE {...} #  when a role is composed into a class (NYI)
+COMPOSE {...} #  when a role is composed into a class (Not yet implemented)
   CLOSE {...} #  appears in a supply block, called when the supply is closed
 =end code