erl_docgen: Fix formatting for nameless <datatype> blocks
erl_docgen: Fix formatting for nameless <datatype> blocks

This is a quick and dirty fix, but there's not a whole lot that
can be done about it without refactoring large swathes of the file.

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