Fix inaccurate doc comments on ClientHook::call().
Fix inaccurate doc comments on ClientHook::call().

maurer/capnproto,rcrowder/capnproto,geofft/capnproto,bsn069/capnproto,mrdomino/capnproto,joliss/capnproto,mrdomino/capnproto,bsn069/capnproto,kamalmarhubi/capnproto,kamalmarhubi/capnproto,MarPiRK/capnproto,geofft/capnproto,jparyani/capnproto,ligzy/capnproto,pjulien/capnproto,hntrmrrs/capnproto,mologie/capnproto,martindale/capnproto,bryce-gibson/capnproto,pjulien/capnproto,ocdtrekkie/capnproto,MarPiRK/capnproto,mologie/capnproto,kamalmarhubi/capnproto,rcrowder/capnproto,ligzy/capnproto,bryce-gibson/capnproto,joliss/capnproto,rcrowder/capnproto,ocdtrekkie/capnproto,hntrmrrs/capnproto,ocdtrekkie/capnproto,jparyani/capnproto,mologie/capnproto,ligzy/capnproto,nagyistoce/capnproto,geofft/capnproto,nagyistoce/capnproto,maurer/capnproto,MarPiRK/capnproto,maurer/capnproto,modulexcite/capnproto,nagyistoce/capnproto,mrdomino/capnproto,bryce-gibson/capnproto,modulexcite/capnproto,hntrmrrs/capnproto,jparyani/capnproto,vladon/capnproto,bsn069/capnproto,martindale/capnproto,modulexcite/capnproto,martindale/capnproto,pjulien/capnproto,vladon/capnproto,vladon/capnproto,joliss/capnproto