small typo in bip47

Author: Giszmo

bip-0047.mediawiki

@@ -174,7 +174,7 @@ Note: this procedure is used if Bob uses a version 1 payment code (regardless of
 ## Bob selects the designated pubkey: <pre>A, where A = aG</pre>
 ## Bob selects the private key associated with his notification address: <pre>b</pre>
 ## Bob calculates a secret point: <pre>S = bA</pre>
-## Bob calculates the binding factor: <pre>s = HMAC-SHA512(x, o)</pre>
+## Bob calculates the blinding factor: <pre>s = HMAC-SHA512(x, o)</pre>
 ### "x" is the x value of the secret point
 ### "o" is the outpoint being spent by the designated input.
 ## Bob interprets the 80 byte payload as a payment code, except: