Documentation: networking: rxrpc: drop doubled word

Drop the doubled word "have".

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Jonathan Corbet <[e-mail]>
Cc: [e-mail]
Cc: "David S. Miller" <[e-mail]>
Cc: Jakub Kicinski <[e-mail]>
Cc: [e-mail]
Cc: David Howells <[e-mail]>
Cc: [e-mail]
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/rxrpc.rst

···
      time [tunable] after the last connection using it discarded, in case a new
      connection is made that could use it.
 
- (#) A client-side connection is only shared between calls if they have have
+ (#) A client-side connection is only shared between calls if they have
      the same key struct describing their security (and assuming the calls
      would otherwise share the connection).  Non-secured calls would also be
      able to share connections with each other.