Fixes broken link refs #561 #1833

Author: JJ

doc/Type/Proc/Async.pod6

@@ -199,7 +199,7 @@ Use L«C<.Supply>|/type/Proc::Async#method_Supply» for merged STDOUT and STDERR
     multi method bind-stdin(IO::Handle:D $handle)
     multi method bind-stdin(Proc::Async::Pipe:D $pipe)
 
-Sets a handle or a L<Pipe> as a source of STDIN. STDIN of
+Sets a handle or a C<Pipe> as a source of STDIN. STDIN of
 the target process must be writable or
 C<X::Proc::Async::BindOrUse> will be thrown.