fix pod error; pass links test

Author: coke

doc/Language/system.pod6

@@ -61,8 +61,8 @@ other ways of interacting with the system through a low-level interface.
 =head1 Making operating system calls through the native API
 
 The L<C<NativeCall>|/language/nativecall> API can be used to interact with
-system libraries, as well as any other accessible library. This <short
-tutorial|https://docs.perl6.org/language/nativecall#Short_Tutorial_on_calling_a_C_function>
+system libraries, as well as any other accessible library. This
+L<short tutorial|https://docs.perl6.org/language/nativecall#Short_Tutorial_on_calling_a_C_function>
 explains, for instance, how to call system functions such as C<getaddrinfo>
 using that interface; some other functions like C<kill> can also be L<accessed
 that way, via declaration using the NativeCall