[S02] Updated table in "Double-underscore forms".

=END is actually =finish now and =DATA is actually =data (this update
was already in the following paragraphs, but the table was neglected,
which this fixes).

S02-bits.pod

@@ -4341,8 +4341,8 @@ The double-underscore forms are going away:
     __FILE__            $?FILE
     __PACKAGE__         $?PACKAGE
     __SUB__             &?ROUTINE
-    __END__             =begin END
-    __DATA__            =begin DATA
+    __END__             =begin finish
+    __DATA__            =begin data
 
 The C<=begin finish> Pod stream (usually written as just C<=finish>) is
 special in that it assumes there's no corresponding C<=end finish>