Link run, shell subs to non-internal location

This is because when viewing the per-routine file (e.g. run.html), the
location of the "sub shell" link doesn't exist.  By linking to the full
location one is always able to reach the linked documentation.

lib/Type/IO.pod

@@ -363,15 +363,15 @@ The return value is of L<type Proc::Status|/type/Proc::Status>.
     run 'systemctl', 'restart', 'apache2'
 
 Arguments are not subject to shell expansions, shell variable interpolation or
-other shenanigans. See L<#sub shell> if you want that.
+other shenanigans. See L<shell|/type/IO#sub_shell> if you want that.
 
 =head2 sub shell
 
     sub shell($cmd) returns Proc::Status:D
 
 Runs a command through the system shell. All shell meta characters are
 interpreted by the shell, inluding pipes, redirects, environment variable
-substitutions and so on. See L<#sub run> if you don't want that.
+substitutions and so on. See L<run|/type/IO#sub_run> if you don't want that.
 
 The return value is of L<type Proc::Status|/type/Proc::Status>.