fix typo

doc/Language/traps.pod6

@@ -483,7 +483,7 @@ The C<once> block is a block of code that will only run once when it's parent bl
     }
     say "Variable = $var";    # "Variable = 1"
 
-This functionallity also applies to other code blocks like C<sub> and C<while>, not just C<for> loops. Problems arise though, when trying to nest C<once> blocks inside of other code blocks:
+This functionality also applies to other code blocks like C<sub> and C<while>, not just C<for> loops. Problems arise though, when trying to nest C<once> blocks inside of other code blocks:
 
     my $var = 0;
     for 1..10 {