doc: Always have a return value for functions which set internal variables (bug #61681) * call-stack.cc, dirfns.cc, environment.cc, error.cc, help.cc, input.cc, load-save.cc, ls-oct-text.cc, oct-hist.cc, pager.cc, pr-flt-fmt.cc, pr-output.cc, sighandlers.cc, svd.cc, variables.cc, ov-base.cc, ov-java.cc, ov-struct.cc, ov-usr-fcn.cc, ov.cc, pt-eval.cc, disable_diagonal_matrix.m, disable_permutation_matrix.m, disable_range.m: Always have a return value for functions which set internal variables.

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