Fixing spelling in BIP 9

course grained => coarse-grained

Author: joshklop

bip-0009.mediawiki

@@ -217,7 +217,7 @@ Soft forks right now are typically treated as booleans: they go from an inactive
 
 The failure timeout allows eventual reuse of bits even if a soft fork was
 never activated, so it's clear that the new use of the bit refers to a
-new BIP.  It's deliberately very course grained, to take into account
+new BIP.  It's deliberately very coarse-grained, to take into account
 reasonable development and deployment delays.  There are unlikely to be
 enough failed proposals to cause a bit shortage.