Sphinx build is broken from the commit (0906ddb2) because a title underline is too short. This fixed the breakage. Fixes:0906ddb268("Documentation: Add IPA writers guide") Signed-off-by: Hirokazu Honda <hiroh@chromium.org> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>