Remove release note for internal threading/concurrency configure option

not for HDF5 1.14.5.

release_docs/RELEASE.txt

@@ -53,18 +53,6 @@ New Features
       binaries in addition to the debian and rpm installation binaries. Also
       these installer files are no longer compressed into packaged archives.
 
-    - Added configuration option for internal threading/concurrency support:
-
-          CMake:      HDF5_ENABLE_THREADS (ON/OFF) (Default: ON)
-          Autotools:  --enable-threads    (yes/no) (Default: yes)
-
-      This option enables support for threading and concurrency algorithms
-      within the HDF5 library.  It is required for, but separate from, the
-      'threadsafe' configure option, which makes the HDF5 API safe to call from
-      multiple threads.  It is possible to enable the 'threads' option and
-      disable the 'threadsafe' option, but not vice versa.  The 'threads' option
-      must be on to enable the subfiling VFD.
-
     - Moved examples to the HDF5Examples folder in the source tree.
 
       Moved the C++ and Fortran examples from the examples folder to the HDF5Examples