Fix typo in src/transaction.rs

Author: Thabokani

src/transaction.rs

@@ -162,7 +162,7 @@ impl ::std::str::FromStr for OutPoint {
 /// - Indicating whether absolute lock-time (specified in `lock_time` field of [`Transaction`])
 ///   is enabled.
 /// - Indicating and encoding [BIP-68] relative lock-times.
-/// - Indicating whether a transcation opts-in to [BIP-125] replace-by-fee.
+/// - Indicating whether a transaction opts-in to [BIP-125] replace-by-fee.
 ///
 /// Note that transactions spending an output with `OP_CHECKLOCKTIMEVERIFY`MUST NOT use
 /// `Sequence::MAX` for the corresponding input. [BIP-65]