add minimal comments to generator vector table

vectors.pl

 #!/usr/bin/perl -w
 
-# generate vectors.S, the trap/interrupt entry points.
-# there has to be one entry point per interrupt number
+# Generate vectors.S, the trap/interrupt entry points.
+# There has to be one entry point per interrupt number
 # since otherwise there's no way to tell the interrupt
 # number.
 
 print "/* generated by vectors.pl */\n";
+print "/* handlers */\n";
 print ".text\n";
 print ".globl alltraps\n";
 for(my $i = 0; $i < 256; $i++){
@@ -17,9 +18,11 @@ for(my $i = 0; $i < 256; $i++){
     print "\tpushl \$$i\n";
     print "\tjmp alltraps\n";
 }
+
+print "\n/* vector table */\n";
 print ".data\n";
 print ".globl vectors\n";
 print "vectors:\n";
 for(my $i = 0; $i < 256; $i++){
-    print ".long vector$i\n";
+    print "\t.long vector$i\n";
 }