[scala] Add attribute documentation.
[scala] Add attribute documentation.

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MOS_MIGRATED_REVID=107063684

UrbanCompass/bazel,aehlig/bazel,mrdomino/bazel,dslomov/bazel-windows,mbrukman/bazel,bazelbuild/bazel,dslomov/bazel,iamthearm/bazel,meteorcloudy/bazel,damienmg/bazel,dinowernli/bazel,ButterflyNetwork/bazel,iamthearm/bazel,cushon/bazel,UrbanCompass/bazel,zhexuany/bazel,kchodorow/bazel-1,perezd/bazel,meteorcloudy/bazel,hhclam/bazel,mbrukman/bazel,dinowernli/bazel,bazelbuild/bazel,dinowernli/bazel,mikelikespie/bazel,katre/bazel,akira-baruah/bazel,dinowernli/bazel,davidzchen/bazel,dslomov/bazel,aehlig/bazel,aehlig/bazel,mikelikespie/bazel,juhalindfors/bazel-patches,ulfjack/bazel,spxtr/bazel,abergmeier-dsfishlabs/bazel,whuwxl/bazel,davidzchen/bazel,ulfjack/bazel,dropbox/bazel,anupcshan/bazel,variac/bazel,kchodorow/bazel-1,damienmg/bazel,LuminateWireless/bazel,mrdomino/bazel,davidzchen/bazel,mikelalcon/bazel,safarmer/bazel,Asana/bazel,zhexuany/bazel,meteorcloudy/bazel,anupcshan/bazel,abergmeier-dsfishlabs/bazel,snnn/bazel,damienmg/bazel,davidzchen/bazel,mikelikespie/bazel,hhclam/bazel,juhalindfors/bazel-patches,mikelikespie/bazel,kamalmarhubi/bazel,dslomov/bazel-windows,abergmeier-dsfishlabs/bazel,kamalmarhubi/bazel,hermione521/bazel,mbrukman/bazel,Asana/bazel,ButterflyNetwork/bazel,rohitsaboo/bazel,hhclam/bazel,Digas29/bazel,kchodorow/bazel-1,snnn/bazel,mikelalcon/bazel,dropbox/bazel,perezd/bazel,akira-baruah/bazel,hermione521/bazel,mikelalcon/bazel,hermione521/bazel,werkt/bazel,kchodorow/bazel,katre/bazel,UrbanCompass/bazel,damienmg/bazel,mikelikespie/bazel,spxtr/bazel,mrdomino/bazel,dinowernli/bazel,perezd/bazel,davidzchen/bazel,juhalindfors/bazel-patches,safarmer/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,Digas29/bazel,hhclam/bazel,iamthearm/bazel,davidzchen/bazel,spxtr/bazel,snnn/bazel,werkt/bazel,aehlig/bazel,LuminateWireless/bazel,bazelbuild/bazel,whuwxl/bazel,twitter-forks/bazel,rohitsaboo/bazel,kchodorow/bazel,meteorcloudy/bazel,kchodorow/bazel,kamalmarhubi/bazel,ulfjack/bazel,perezd/bazel,dropbox/bazel,twitter-forks/bazel,Digas29/bazel,abergmeier-dsfishlabs/bazel,kchodorow/bazel,zhexuany/bazel,whuwxl/bazel,zhexuany/bazel,dslomov/bazel-windows,katre/bazel,variac/bazel,whuwxl/bazel,iamthearm/bazel,spxtr/bazel,kamalmarhubi/bazel,iamthearm/bazel,anupcshan/bazel,UrbanCompass/bazel,hermione521/bazel,meteorcloudy/bazel,juhalindfors/bazel-patches,cushon/bazel,twitter-forks/bazel,aehlig/bazel,ulfjack/bazel,whuwxl/bazel,mbrukman/bazel,hermione521/bazel,mikelalcon/bazel,safarmer/bazel,meteorcloudy/bazel,mikelalcon/bazel,dropbox/bazel,dslomov/bazel-windows,ButterflyNetwork/bazel,kchodorow/bazel,ulfjack/bazel,dslomov/bazel,zhexuany/bazel,dslomov/bazel,zhexuany/bazel,dropbox/bazel,dropbox/bazel,akira-baruah/bazel,abergmeier-dsfishlabs/bazel,variac/bazel,cushon/bazel,mbrukman/bazel,kchodorow/bazel-1,kchodorow/bazel-1,LuminateWireless/bazel,kamalmarhubi/bazel,ulfjack/bazel,anupcshan/bazel,juhalindfors/bazel-patches,whuwxl/bazel,mikelikespie/bazel,akira-baruah/bazel,variac/bazel,cushon/bazel,rohitsaboo/bazel,anupcshan/bazel,hhclam/bazel,werkt/bazel,rohitsaboo/bazel,spxtr/bazel,juhalindfors/bazel-patches,Digas29/bazel,kamalmarhubi/bazel,Asana/bazel,werkt/bazel,safarmer/bazel,ButterflyNetwork/bazel,abergmeier-dsfishlabs/bazel,safarmer/bazel,dslomov/bazel,variac/bazel,meteorcloudy/bazel,akira-baruah/bazel,UrbanCompass/bazel,mrdomino/bazel,variac/bazel,mrdomino/bazel,kchodorow/bazel,katre/bazel,werkt/bazel,snnn/bazel,dslomov/bazel,safarmer/bazel,hhclam/bazel,LuminateWireless/bazel,bazelbuild/bazel,aehlig/bazel,LuminateWireless/bazel,hermione521/bazel,twitter-forks/bazel,dslomov/bazel-windows,spxtr/bazel,spxtr/bazel,damienmg/bazel,Digas29/bazel,mbrukman/bazel,snnn/bazel,rohitsaboo/bazel,Asana/bazel,iamthearm/bazel,cushon/bazel,davidzchen/bazel,aehlig/bazel,akira-baruah/bazel,snnn/bazel,katre/bazel,cushon/bazel,dinowernli/bazel,variac/bazel,mrdomino/bazel,twitter-forks/bazel,anupcshan/bazel,dslomov/bazel-windows,damienmg/bazel,twitter-forks/bazel,perezd/bazel,Asana/bazel,kchodorow/bazel-1,rohitsaboo/bazel,LuminateWireless/bazel,Asana/bazel,werkt/bazel,ulfjack/bazel,snnn/bazel,damienmg/bazel,dslomov/bazel,katre/bazel,kchodorow/bazel,perezd/bazel,Digas29/bazel,mikelalcon/bazel,juhalindfors/bazel-patches,ButterflyNetwork/bazel,Asana/bazel,perezd/bazel,bazelbuild/bazel,bazelbuild/bazel,UrbanCompass/bazel