Fix some typos in the membrane comments.
Fix some typos in the membrane comments.

joliss/capnproto,pjulien/capnproto,rcrowder/capnproto,mologie/capnproto,maurer/capnproto,hntrmrrs/capnproto,mologie/capnproto,vladon/capnproto,pjulien/capnproto,jparyani/capnproto,jparyani/capnproto,joliss/capnproto,vladon/capnproto,hntrmrrs/capnproto,mologie/capnproto,vladon/capnproto,maurer/capnproto,mrdomino/capnproto,mrdomino/capnproto,joliss/capnproto,maurer/capnproto,hntrmrrs/capnproto,pjulien/capnproto,rcrowder/capnproto,mrdomino/capnproto,rcrowder/capnproto,jparyani/capnproto