The built-in exceptions are not still strings, so make no claims about them.

Doc/tut.tex

@@ -3321,7 +3321,6 @@ class, the class name is printed, then a colon and a space, and
 finally the instance converted to a string using the built-in function
 \function{str()}.
 
-In this release, the built-in exceptions are still strings.
 
 \chapter{What Now?}
 \label{whatNow}

Doc/tut/tut.tex

@@ -3321,7 +3321,6 @@ class, the class name is printed, then a colon and a space, and
 finally the instance converted to a string using the built-in function
 \function{str()}.
 
-In this release, the built-in exceptions are still strings.
 
 \chapter{What Now?}
 \label{whatNow}