Fix minor typo

S04-control.pod

@@ -611,7 +611,7 @@ parenthesis, much like the C<$> operator in Haskell.  That is, precedence
 decisions do not cross a C<do> boundary, and the missing "right paren" is
 assumed at the next statement terminator or unmatched bracket.  A C<do> is
 unnecessary immediately after any opening bracket as the syntax inside
-brackets expects a statements, so the above can in fact be written:
+brackets expects a statement, so the above can in fact be written:
 
     @primesquares = ($_ if .is-prime for 1..100) »**» 2;