[gtk-doc] mkpdf: update fop comment

[Stefan Sauer <stefkost src gnome org>]

commit c16f496e96e0d6af4cdef8f35e3c414e5dec7cf0
Author: Stefan Sauer <ensonic users sf net>
Date:   Fri Mar 31 21:59:40 2017 +0200

    mkpdf: update fop comment
    
    We should probably re-test this and if still bad remove.

 gtkdoc/mkpdf.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gtkdoc/mkpdf.py b/gtkdoc/mkpdf.py
index 0b456aa..abcc5f5 100755
--- a/gtkdoc/mkpdf.py
+++ b/gtkdoc/mkpdf.py
@@ -109,8 +109,8 @@ def run(options):
                            module + '.fo',
                            gtkdocdir + '/gtk-doc-fo.xsl',
                            document])
-        # fop dies too easily :(
-        # config.fop $module.fo $module.pdf
+        # TODO: fop dies too easily :(
+        # res = subprocess.call([config.fop, module + '.fo', module + '.pdf'))
         fname = module + '.fo'
         if os.path.exists(fname):
             os.unlink(fname)