cp#2013101510000026: fix file coruption caused by comments' doc export

Plcfbkl contains only character positions. The Plcfbkf is that one
which contains additional informations.

Change-Id: I9bd8eec5c8e64d9d757764dae51bcb866456cdc9
(cherry picked from commit 3ed870e237a0b7b95f48bfb8192fe7d5c2957a03)