1. To give the user a clue about the expiration timeout values, mention    the default timeouts of 1800 (activity) and 15 (inactivity) seconds.
1. To give the user a clue about the expiration timeout values, mention
   the default timeouts of 1800 (activity) and 15 (inactivity) seconds.

2. Fix the "ifinfo" ASCII control message description:
   it requires the interface number as an argument.

MFC after:	2 days

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