avoid dupe words in sample text

Author: coke

doc/Type/IO/Spec/Unix.pod6

@@ -123,7 +123,7 @@ Returns the string C<"/dev/null"> representing the
 L<"Null device"|https://en.wikipedia.org/wiki/Null_device>:
 
 =for code
-$*SPEC.devnull.IO.spurt: "blah blah";
+$*SPEC.devnull.IO.spurt: "foo bar baz";
 
 =head2 method dir-sep
 

doc/Type/IO/Spec/Win32.pod6

@@ -103,7 +103,7 @@ Returns the string C<"nul"> representing the
 L<"Null device"|https://en.wikipedia.org/wiki/Null_device>:
 
 =for code
-$*SPEC.devnull.IO.spurt: "blah blah";
+$*SPEC.devnull.IO.spurt: "foo bar baz";
 
 =head2 method dir-sep