net: dccp: kerneldoc fixes

Simple fixes which require no deep knowledge of the code.

Cc: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dccp/input.c

@@ -715,6 +715,7 @@ EXPORT_SYMBOL_GPL(dccp_rcv_state_process);
 
 /**
  *  dccp_sample_rtt  -  Validate and finalise computation of RTT sample
+ *  @sk:	socket structure
  *  @delta:	number of microseconds between packet and acknowledgment
  *
  *  The routine is kept generic to work in different contexts. It should be