travis: Move doc build to be start earlier in parallel build
travis: Move doc build to be start earlier in parallel build

travis only start 5 jobs and before this change the doc build
was always pushed until after another build was done so it
took a very long time to finish one build.

ferd/otp,rlipscombe/otp,emacsmirror/erlang,jj1bdx/otp,erlang/otp,vladdu/otp,mikpe/otp,isvilen/otp,dumbbell/otp,vladdu/otp,dumbbell/otp,jj1bdx/otp,bjorng/otp,emacsmirror/erlang,dumbbell/otp,kvakvs/otp,dgud/otp,g-andrade/otp,getong/otp,lrascao/otp,mikpe/otp,rlipscombe/otp,lrascao/otp,erlang/otp,potatosalad/otp,lrascao/otp,uabboli/otp,uabboli/otp,isvilen/otp,potatosalad/otp,isvilen/otp,mikpe/otp,bjorng/otp,uabboli/otp,bjorng/otp,vinoski/otp,getong/otp,potatosalad/otp,emacsmirror/erlang,uabboli/otp,isvilen/otp,kvakvs/otp,lrascao/otp,uabboli/otp,emacsmirror/erlang,erlang/otp,vladdu/otp,g-andrade/otp,ferd/otp,dumbbell/otp,lrascao/otp,vladdu/otp,getong/otp,dgud/otp,dgud/otp,kvakvs/otp,jj1bdx/otp,kvakvs/otp,mikpe/otp,isvilen/otp,electricimp/otp,kvakvs/otp,getong/otp,g-andrade/otp,ferd/otp,rlipscombe/otp,rlipscombe/otp,electricimp/otp,g-andrade/otp,uabboli/otp,erlang/otp,lrascao/otp,dumbbell/otp,potatosalad/otp,electricimp/otp,emacsmirror/erlang,jj1bdx/otp,bjorng/otp,ferd/otp,mikpe/otp,getong/otp,dgud/otp,dumbbell/otp,lrascao/otp,mikpe/otp,mikpe/otp,jj1bdx/otp,uabboli/otp,ferd/otp,bjorng/otp,emacsmirror/erlang,isvilen/otp,vladdu/otp,ferd/otp,g-andrade/otp,dgud/otp,getong/otp,vinoski/otp,g-andrade/otp,erlang/otp,vinoski/otp,ferd/otp,uabboli/otp,erlang/otp,getong/otp,vinoski/otp,lrascao/otp,rlipscombe/otp,potatosalad/otp,emacsmirror/erlang,potatosalad/otp,vinoski/otp,dgud/otp,getong/otp,rlipscombe/otp,dumbbell/otp,mikpe/otp,rlipscombe/otp,mikpe/otp,potatosalad/otp,potatosalad/otp,vinoski/otp,isvilen/otp,getong/otp,vinoski/otp,vladdu/otp,jj1bdx/otp,dumbbell/otp,ferd/otp,dgud/otp,kvakvs/otp,potatosalad/otp,electricimp/otp,ferd/otp,g-andrade/otp,electricimp/otp,vinoski/otp,g-andrade/otp,vladdu/otp,isvilen/otp,electricimp/otp,jj1bdx/otp,kvakvs/otp,dumbbell/otp,rlipscombe/otp,dgud/otp,erlang/otp,g-andrade/otp,electricimp/otp,rlipscombe/otp,kvakvs/otp,vinoski/otp,bjorng/otp,isvilen/otp,rlipscombe/otp,electricimp/otp,electricimp/otp,dumbbell/otp,bjorng/otp,g-andrade/otp,jj1bdx/otp,uabboli/otp,kvakvs/otp,mikpe/otp,erlang/otp,dgud/otp,erlang/otp,vladdu/otp,potatosalad/otp,emacsmirror/erlang,emacsmirror/erlang,jj1bdx/otp,dgud/otp,vladdu/otp,isvilen/otp,lrascao/otp,vinoski/otp,bjorng/otp,emacsmirror/erlang,getong/otp,bjorng/otp,erlang/otp,bjorng/otp,jj1bdx/otp