bisect-runner.pl: Fix too long verbatim in pod

Verbatim lines only have to be indented one space to be effective and to
show as offset from the surrounding text.  By decreasing the
indentation, this commit causes the lines not to wrap.

diff --git a/Porting/bisect-runner.pl b/Porting/bisect-runner.pl
index 4d7a6f2..174ea5c 100755 (executable)
--- a/Porting/bisect-runner.pl
+++ b/Porting/bisect-runner.pl
@@ -139,27 +139,27 @@ bisect.pl - use git bisect to pinpoint changes
 
 =head1 SYNOPSIS
 
-    # When did this become an error?
-    .../Porting/bisect.pl -e 'my $a := 2;'
-    # When did this stop being an error?
-    .../Porting/bisect.pl --expect-fail -e '1 // 2'
-    # When did this test start failing?
-    .../Porting/bisect.pl --target t/op/sort.t
-    # When were all lines matching this pattern removed from all files?
-    .../Porting/bisect.pl --match '\b(?:PL_)hash_seed_set\b'
-    # When was some line matching this pattern added to some file?
-    .../Porting/bisect.pl --expect-fail --match '\buseithreads\b'
-    # When did this test program stop exiting 0?
-    .../Porting/bisect.pl -- ./perl -Ilib ../test_prog.pl
-    # When did this test program start crashing (any signal or coredump)?
-    .../Porting/bisect.pl --crash -- ./perl -Ilib ../test_prog.pl
-    # When did this first become valid syntax?
-    .../Porting/bisect.pl --target=miniperl --end=v5.10.0 \
-         --expect-fail -e 'my $a := 2;'
-    # What was the last revision to build with these options?
-    .../Porting/bisect.pl --test-build -Dd_dosuid
-    # When did this test program start generating errors from valgrind?
-    .../Porting/bisect.pl --valgrind ../test_prog.pl
+ # When did this become an error?
+ .../Porting/bisect.pl -e 'my $a := 2;'
+ # When did this stop being an error?
+ .../Porting/bisect.pl --expect-fail -e '1 // 2'
+ # When did this test start failing?
+ .../Porting/bisect.pl --target t/op/sort.t
+ # When were all lines matching this pattern removed from all files?
+ .../Porting/bisect.pl --match '\b(?:PL_)hash_seed_set\b'
+ # When was some line matching this pattern added to some file?
+ .../Porting/bisect.pl --expect-fail --match '\buseithreads\b'
+ # When did this test program stop exiting 0?
+ .../Porting/bisect.pl -- ./perl -Ilib ../test_prog.pl
+ # When did this test program start crashing (any signal or coredump)?
+ .../Porting/bisect.pl --crash -- ./perl -Ilib ../test_prog.pl
+ # When did this first become valid syntax?
+ .../Porting/bisect.pl --target=miniperl --end=v5.10.0 \
+      --expect-fail -e 'my $a := 2;'
+ # What was the last revision to build with these options?
+ .../Porting/bisect.pl --test-build -Dd_dosuid
+ # When did this test program start generating errors from valgrind?
+ .../Porting/bisect.pl --valgrind ../test_prog.pl
 
 =head1 DESCRIPTION