Minor terminology fixes

Author: EthanHeilman

bip-0360.mediawiki

@@ -515,7 +515,7 @@ tapleaf script = [size] [OP_PUSHBYTES_32, 32-byte public key, OP_CHECKSIG] (1 +
 control block = [size] [control byte]  (1 + 1 = 2 bytes)
 </source>
 
-P2TR key-spend witness (66 bytes):
+P2TR key path spend witness (66 bytes):
 <source>
 [count] (1 byte), # Number of elements in the witness
 [size] signature (1 + 64 bytes = 65 bytes)