doc: Remove extra spaces at start of docstring which show up in Info format. * intro.txi: Use blank line between end of example and seealso. * utils.cc: Remove stray comment from previous cset. * annotation.m: Overhaul docstring. * subspace.m: Re-indent academic reference. * condest.m: Remove blank column of spaces in front of license. * onenormest.m: Remove blank column of spaces in front of license. * sinc.m: Remove extra single space at start of line. * invhilb.m: Remove extra single space at start of line. * gls.m: Remove extra single space at start of line. * ols.m: Remove extra single space at start of line.