Move snapper pod into Telemetry

Author: lizmat

doc/Type/Telemetry.pod6

@@ -324,6 +324,20 @@ If that is not set either, defaults to True.
 If there are C<snap>s available in the internal array at the end of the
 program, then C<report> will be automatically generated and printed on C<STDERR>.
 
+=head 2 module snapper
+
+Start a thread taking repeated system state snapshots.
+
+This module contains no subroutines or methods or anything.  It is intended
+as a shortcut for starting the L<snapper> subroutine of the C<Telemetry> module,
+allowing taking snapshots of the execution of a program without needing to change
+the program.  Simple loading the module with C<-Msnapper> will do all that is
+needed to start the snapper, and have a report printed on STDERR upon completion
+of the program.
+
+The C<RAKUDO_SNAPPER> environment variable can be set to indicate the time
+between snapshots.  If not specified, it will default to B<0.1> seconds.
+
 =end pod
 
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