Update routing.asciidoc

duplicate word.

routing.asciidoc

@@ -250,7 +250,7 @@ The combination of the condition, and a timeout on the condition gives the payme
 === Conditional Chained Payment ===
 
 Building upon our conditional payment, it may be possible to *chain* this payment, allowing it to involve the payer, the payee, and possibly several intermediaries. 
-Each intermediary, is able to present a _slightly_ modified version of the condition (without invalidating it all together), and so so in an iterated manner until the conditional payment reaches the payee.
+Each intermediary, is able to present a _slightly_ modified version of the condition (without invalidating it all together), and so in an iterated manner until the conditional payment reaches the payee.
 Once it reaches the payee, then the payment should be able to be _iteratively_ resolved, starting at the payee all the way back to the payer. 
 
 Each chaining creates an "incoming" and "outgoing" conditional payment.