Comment fix from Jim: argument A in xsyconv.f should be in,out

git-svn-id: https://icl.cs.utk.edu/svn/lapack-dev/lapack/trunk@1509 8a072113-8704-0410-8d35-dd094bca7971
Comment Fix from Jim: Update of Purpose section of Jacobi SVD about accuracy

git-svn-id: https://icl.cs.utk.edu/svn/lapack-dev/lapack/trunk@1510 8a072113-8704-0410-8d35-dd094bca7971