doc: Add final touches to 1.4.0 release notes
doc: Add final touches to 1.4.0 release notes

Remove the "draft" notice and update commit numbers. That's all.

Signed-off-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>

janesma/waffle,dcbaker/waffle,janesma/waffle,chadversary/waffle,waffle-gl/waffle,waffle-gl/waffle,waffle-gl/waffle,maurossi/waffle,evelikov/waffle,yinquan529/waffle-gl-waffle,evelikov/waffle,fjhenigman/waffle,fjhenigman/waffle,waffle-gl/waffle,evelikov/waffle,chadversary/waffle,maurossi/waffle,janesma/waffle,yinquan529/waffle-gl-waffle,dcbaker/waffle,maurossi/waffle,chadversary/waffle,dcbaker/waffle,yinquan529/waffle-gl-waffle,fjhenigman/waffle