Merge pull request bitcoin#588 from starcharles/fixed-typo

BIP-0175: fixed typo.

Author: luke-jr

bip-0175.mediawiki

@@ -195,7 +195,7 @@ As an input, we have a contract that consists of two documents, below are conten
 
 verification example 1 (negative test):
 
-Similarliy to the input above, excpet this time we have a contract that consists of one document, below is content:
+Similarliy to the input above, except this time we have a contract that consists of one document, below is content:
 
   document 1:
   baz