fix unclosed L<>

Author: gfldex

doc/Type/Num.pod6

@@ -27,7 +27,7 @@ Returns a pseudo random number between 0 and the invocant.
 
     sub srand(Int $seed) returns Int:D
 
-Seeds the pseudo random number generator used by L<Num.rand|/typeNum#rand) with
+Seeds the pseudo random number generator used by L<Num.rand|/typeNum#rand> with
 the provided value. Note that C<srand> is called with a platform dependent
 value when a Perl 6 program is started.