Fixed links to :r, :w, and :x

Author: jonbeebe

doc/Type/IO.pod6

@@ -45,11 +45,11 @@ L«C<IO::Path>|/type/IO::Path» object. The available file tests are:
 
 =item C<:d> — check L«C<.d>|/routine/d» returns C<True>
 
-=item C<:r> — check L«C<.r>|/routine/d» returns C<True>
+=item C<:r> — check L«C<.r>|/routine/r» returns C<True>
 
-=item C<:w> — check L«C<.w>|/routine/d» returns C<True>
+=item C<:w> — check L«C<.w>|/routine/w» returns C<True>
 
-=item C<:x> — check L«C<.x>|/routine/d» returns C<True>
+=item C<:x> — check L«C<.x>|/routine/x» returns C<True>
 
 By default, only C<:d> test is performed.