doc: fix pdf build warning

Fix a pdf doc build warning where a link wasn't recognised:

    doc/guides/contributing/documentation.rst::
        WARNING: unusable reference target found: inkscape.org

Signed-off-by: John McNamara <john.mcnamara@intel.com>
Acked-by: Harry van Haaren <harry.van.haaren@intel.com>

diff --git a/doc/guides/contributing/documentation.rst b/doc/guides/contributing/documentation.rst
index 7c1eb41..7f5f061 100644 (file)
--- a/doc/guides/contributing/documentation.rst
+++ b/doc/guides/contributing/documentation.rst
@@ -477,7 +477,7 @@ Images
 * The DPDK documentation contains some legacy images in PNG format.
   These will be converted to SVG in time.
 
-* `Inkscape <inkscape.org>`_ is the recommended graphics editor for creating the images.
+* `Inkscape <http://inkscape.org>`_ is the recommended graphics editor for creating the images.
   Use some of the older images in ``doc/guides/prog_guide/img/`` as a template, for example ``mbuf1.svg``
   or ``ring-enqueue.svg``.