update release note to 1.0.0.pre

Author: wkliao

RELEASE_NOTES.md

@@ -1,12 +1,12 @@
 # PnetCDF-Python Release Notes
 
-### Version 1.0.0 (September 12, 2024)
+### Version 1.0.0.pre (September 12, 2024)
 
 * First release of PnetCDF-Python package, a Python interface to PnetCDF-C
   parallel I/O library.
 * User Guide is provided in https://pnetcdf-python.readthedocs.io/en/latest
-* A high-level comparison between PnetCDF and NetCDF4 is described in
-  file `docs/nc4_vs_pnetcdf.md`
+* A high-level comparison between Python packages of PnetCDF and NetCDF4 is
+  described in file `docs/nc4_vs_pnetcdf.md`
 * Several python example programs are available in folder `examples`.
 * Source codes are stored in its github repository at
   https://github.com/Parallel-NetCDF/PnetCDF-Python