Documentation: networking: dsa: drop doubled word

Drop the doubled word "in".

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: Andrew Lunn <[e-mail]>
Cc: Vivien Didelot <[e-mail]>
Cc: Florian Fainelli <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/networking/dsa/dsa.rst

···
 Networking stack hooks
 ----------------------
 
-When a master netdev is used with DSA, a small hook is placed in in the
+When a master netdev is used with DSA, a small hook is placed in the
 networking stack is in order to have the DSA subsystem process the Ethernet
 switch specific tagging protocol. DSA accomplishes this by registering a
 specific (and fake) Ethernet type (later becoming ``skb->protocol``) with the