Documentation: drm: Use '->' when describing access through pointers.

The documentation is trying to describe accessing a field through a
pointer, but it is using '-<' instead of '->'. Fix that.

Signed-off-by: Liviu Dudau <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

Documentation/DocBook/drm.tmpl

···
           </para>
           <para>
             If a page flip can be successfully scheduled the driver must set the
-            <code>drm_crtc-&lt;fb</code> field to the new framebuffer pointed to
+            <code>drm_crtc-&gt;fb</code> field to the new framebuffer pointed to
             by <code>fb</code>. This is important so that the reference counting
             on framebuffers stays balanced.
           </para>