[kernel-doc] fix various DocBook build problems/warnings
Most serious is fixing include/sound/pcm.h, which breaks the DocBook
build.
The other stuff is just filling in things that cause warnings.
diff --git a/drivers/net/wan/syncppp.c b/drivers/net/wan/syncppp.c
index f58c794..b56a7b5 100644
--- a/drivers/net/wan/syncppp.c
+++ b/drivers/net/wan/syncppp.c
@@ -1440,6 +1440,7 @@
* @skb: The buffer to process
* @dev: The device it arrived on
* @p: Unused
+ * @orig_dev: Unused
*
* Protocol glue. This drives the deferred processing mode the poorer
* cards use. This can be called directly by cards that do not have