Update docs/release-notes/changelog/v6.0.x.rst

Co-authored-by: Jeff Squyres <[email protected]>
Signed-off-by: Edgar Gabriel <[email protected]>

Author: edgargabriel

docs/release-notes/changelog/v6.0.x.rst

@@ -64,7 +64,7 @@ Open MPI version v6.0.0
     and Allreduce in the base collective component, and adjusted the ``tuned``
     component to better utilize these collectives.
 
-  - Added new json file format to tune the ``tuned`` collective component.
+  - Added new JSON file format to tune the ``tuned`` collective component.
 
   - Extended the ``accelerator`` collective component to support
     more collective operations on device buffers.