Update release notes

RELEASE_NOTES.md

@@ -6,7 +6,7 @@ Release Notes       {#RELEASE_NOTES}
 This file contains a high-level description of this package's evolution. Releases are in reverse chronological order (most recent first). Note that, as of netcdf 4.2, the `netcdf-c++` and `netcdf-fortran` libraries have been separated into their own libraries.
 
 ## 4.9.3 - TBD
-
+* Cleanup a number of misc issues. See [Github #2763](https://github.com/Unidata/netcdf-c/pull/2763).
 * Mitigate the problem of test interference. See [Github #2755](https://github.com/Unidata/netcdf-c/pull/2755).
 * Extend NCZarr to support unlimited dimensions. See [Github #2755](https://github.com/Unidata/netcdf-c/pull/2755).
 * Fix significant bug in the NCZarr cache management. See [Github #2737](https://github.com/Unidata/netcdf-c/pull/2737).