DocBook/drm: Use a colon

Signed-off-by: Michael Witten <mfwitten@gmail.com>

Documentation/DocBook/drm.tmpl

@@ -508,7 +508,7 @@
 	<title>Output discovery and initialization</title>
 	<para>
 	  Several core functions exist to create CRTCs, encoders, and
-	  connectors, namely drm_crtc_init(), drm_connector_init(), and
+	  connectors, namely: drm_crtc_init(), drm_connector_init(), and
 	  drm_encoder_init(), along with several "helper" functions to
 	  perform common tasks.
 	</para>