doc: fix sphinx warning
authorThomas Monjalon <thomas@monjalon.net>
Wed, 19 Apr 2017 12:00:29 +0000 (14:00 +0200)
committerThomas Monjalon <thomas@monjalon.net>
Wed, 19 Apr 2017 13:33:51 +0000 (15:33 +0200)
commit8bc74683de1c744aed19a5822a9f91dddcc7918b
tree6999a609b2bac1ecd20bba3540bae870f1b1e90d
parented1df6c569ae6b83666b593e10ea53c88d3843de
doc: fix sphinx warning

Seen with recent version of sphinx:
WARNING: latex_preamble conflicts with latex_elements['preamble'], ignored.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Tested-by: Ferruh Yigit <ferruh.yigit@intel.com>
doc/guides/conf.py