[media] frontend.h, Docbook: Improve status documentation

No functional changes. It just improves the description of the frontend
status, using Documentation/kernel-doc-nano-HOWTO.txt for the status
enumeration, and a table inside the DocBook.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/include/linux/dvb/frontend.h b/include/linux/dvb/frontend.h
index c92b4d6..bb51edf 100644
--- a/include/linux/dvb/frontend.h
+++ b/include/linux/dvb/frontend.h
@@ -121,16 +121,27 @@
 } fe_sec_mini_cmd_t;
 
 
+/**
+ * enum fe_status - enumerates the possible frontend status
+ * @FE_HAS_SIGNAL:	found something above the noise level
+ * @FE_HAS_CARRIER:	found a DVB signal
+ * @FE_HAS_VITERBI:	FEC is stable
+ * @FE_HAS_SYNC:	found sync bytes
+ * @FE_HAS_LOCK:	everything's working
+ * @FE_TIMEDOUT:	no lock within the last ~2 seconds
+ * @FE_REINIT:		frontend was reinitialized, application is recommended
+ *			to reset DiSEqC, tone and parameters
+ */
+
 typedef enum fe_status {
-	FE_HAS_SIGNAL	= 0x01,   /* found something above the noise level */
-	FE_HAS_CARRIER	= 0x02,   /* found a DVB signal  */
-	FE_HAS_VITERBI	= 0x04,   /* FEC is stable  */
-	FE_HAS_SYNC	= 0x08,   /* found sync bytes  */
-	FE_HAS_LOCK	= 0x10,   /* everything's working... */
-	FE_TIMEDOUT	= 0x20,   /* no lock within the last ~2 seconds */
-	FE_REINIT	= 0x40    /* frontend was reinitialized,  */
-} fe_status_t;			  /* application is recommended to reset */
-				  /* DiSEqC, tone and parameters */
+	FE_HAS_SIGNAL		= 0x01,
+	FE_HAS_CARRIER		= 0x02,
+	FE_HAS_VITERBI		= 0x04,
+	FE_HAS_SYNC		= 0x08,
+	FE_HAS_LOCK		= 0x10,
+	FE_TIMEDOUT		= 0x20,
+	FE_REINIT		= 0x40,
+} fe_status_t;
 
 typedef enum fe_spectral_inversion {
 	INVERSION_OFF,