Added missing method definition

Jan-Olof Hendig · Jan-Olof Hendig · commit bb96b2bf647c · 2017-07-02T21:25:22.000+02:00
diff --git a/doc/Type/Proc.pod6 b/doc/Type/Proc.pod6
@@ -119,6 +119,8 @@ merged in C<$proc.out>.
 
 =head2 method sink
 
+    method sink(--> Nil)
+
 When sunk, the C<Proc> object will throw L<X::Proc::Unsuccessful>
 if the process it ran exited unsuccessfully.
 
