Correct the Pod used to block comment a section of git log output.

Correct the Pod used to block comment a section of git log output.

Commit 31940c077ae95db7 added some git log output. To avoid the need to
re-indent it, it was "commented out" using Pod. However, the Pod used was
buggy. It used a =for, when it should have used a =begin/=end pair.

Without this, Pod renderers display the "comment" as if it is part of the
documentation, which isn't desired.