Update proposals/1915-unbind-identity-server-param.md
Update proposals/1915-unbind-identity-server-param.md

Co-Authored-By: erikjohnston <3e283cfbe4f05775eb7cb24272079d9b1ef5d09d@jki.re>
matrix-org/matrix-doc,matrix-org/matrix-doc,matrix-org/matrix-doc,matrix-org/matrix-doc