Added docs for X::IO::Link

Author: Jan-Olof Hendig

doc/Type/X/IO/Link.pod

@@ -0,0 +1,25 @@
+=begin pod
+
+=TITLE class X::IO::Link
+
+=SUBTITLE Error while trying to create a link
+
+    class X::IO::Link does X::IO is Exception
+
+Error class for failed L<&link> operation.
+
+A typical error message is
+
+    Failed to create link called 'my-link' on target 'does-not exist': Failed to link file
+
+=head1 Methods
+
+=head2 method target
+
+Returns the name of the link target, i.e. the existing file.
+
+=head2 method name
+
+Returns the name of the link that could not be created.
+
+=end pod

type-graph.txt

@@ -349,6 +349,7 @@ class X::IO::Chdir                  is Exception   does X::IO
 class X::IO::Dir                    is Exception   does X::IO
 class X::IO::Cwd                    is Exception   does X::IO
 class X::IO::Rmdir                  is Exception   does X::IO
+class X::IO::Link                   is Exception   does X::IO
 class X::IO::Unlink                 is Exception   does X::IO
 class X::IO::Symlink                is Exception   does X::IO
 class X::IO::Chmod                  is Exception   does X::IO