Merge pull request bitcoin#600 from flack/patch-1

Typo fix

Author: luke-jr

bip-0115.mediawiki

@@ -83,7 +83,7 @@ Why are block heights required to be absolute, rather than relative?
 Why are blocks older than 52596 deep in the chain not verified?
 
 * This is to avoid creating an infinite storage requirement from all full nodes which would be necessary to maintain all the block headers indefinitely. 52596 block headers requires a fixed size of approximately 4 MB.
-* In any case where you might want to specify a deeper block, you can also just as well specify a more recent one that decends from it.
+* In any case where you might want to specify a deeper block, you can also just as well specify a more recent one that descends from it.
 * It is assumed that 1 year is sufficient time to double-spend any common UTXOs on all blockchains of interest.
 * If a deeper check is needed, it can be softforked in. Making the check more shallow, on the other hand, is a hardfork.