fix typo

src/core/Exception.pm

@@ -1700,7 +1700,7 @@ my class X::Backslash::NonVariableDollar does X::Syntax {
 my class X::ControlFlow is Exception {
     has $.illegal;   # something like 'next'
     has $.enclosing; # ....  outside a loop
-    has $.backtrace; # where the bougs control flow op was
+    has $.backtrace; # where the bogus control flow op was
 
     method backtrace() {
         $!backtrace || nextsame();