docs: n/a -> none.

kenjis · kenjis · commit c71c535190ce · 2022-01-04T16:45:10.000+09:00
diff --git a/user_guide_src/source/installation/upgrade_416.rst b/user_guide_src/source/installation/upgrade_416.rst
@@ -17,7 +17,7 @@ Due to a bug fix, the Validation now might change the validation results when yo
 Breaking Enhancements
 *********************
 
-n/a
+none.
 
 Project Files
 *************
