BIP8: fix typo: 2 retarget intervals are 4032 blocks.

bip-0008.mediawiki

@@ -55,7 +55,7 @@ The following guidelines are suggested for selecting these parameters for a soft
 A later deployment using the same bit is possible as long as the startheight is after the previous one's
 timeoutheight or activation, but it is discouraged until necessary, and even then recommended to have a pause in between to detect buggy software.
 
-'''startheight''' and '''timeoutheight''' must be an exact multiple of 2016 (ie, at a retarget boundary), and '''timeoutheight''' must be at least 4096 blocks (2 retarget intervals) after '''startheight'''.
+'''startheight''' and '''timeoutheight''' must be an exact multiple of 2016 (ie, at a retarget boundary), and '''timeoutheight''' must be at least 4032 blocks (2 retarget intervals) after '''startheight'''.
 
 ===States===