net: Fix (nearly-)kernel-doc comments for various functions

Fix incorrect start markers, wrapped summary lines, missing section
breaks, incorrect separators, and some name mismatches.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index 3c83035..a5a402a 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -531,7 +531,7 @@
 }
 EXPORT_SYMBOL_GPL(xprt_set_retrans_timeout_def);
 
-/*
+/**
  * xprt_set_retrans_timeout_rtt - set a request's retransmit timeout
  * @task: task whose timeout is to be set
  *