settling docs for PR440, fixes #436

Author: ahbarnett

CHANGELOG

@@ -2,7 +2,8 @@ List of features / changes made / release notes, in reverse chronological order.
 If not stated, FINUFFT is assumed (cuFINUFFT <=1.3 is listed separately).
 
 * New foldrescale, removes [-3pi,3pi) restriction on NU points, and slight
-  speedup at large tols. PR #440 (Marco Barbone + Martin Reinecke)
+  speedup at large tols. Deprecates both opts.chkbnds and error code
+  FINUFFT_ERR_SPREAD_PTS_OUT_RANGE.  PR #440 (Marco Barbone + Martin Reinecke)
 * CPU plan stage allows any # threads, warns if > omp_get_max_threads(); or
   if single-threaded fixes nthr=1 and warns opts.nthreads>1 attempt.
   Sort now respects spread_opts.sort_threads not nthreads. Supercedes PR 431.