Fix typo 'epected' -> 'expected'

Fix minor spelling mistake in code comments.

Author: tcharding

src/key.rs

@@ -1577,7 +1577,7 @@ mod test {
         let sk = SecretKey::from_slice(&SK_BYTES).expect("sk");
 
         // In fuzzing mode secret->public key derivation is different, so
-        // hard-code the epected result.
+        // hard-code the expected result.
         #[cfg(not(fuzzing))]
         let pk = PublicKey::from_secret_key(&s, &sk);
         #[cfg(fuzzing)]
@@ -1861,7 +1861,7 @@ mod test {
         let sk = SecretKey::from_slice(&SK_BYTES).unwrap();
 
         // In fuzzing mode secret->public key derivation is different, so
-        // hard-code the epected result.
+        // hard-code the expected result.
         #[cfg(not(fuzzing))]
         let pk = PublicKey::from_secret_key(&s, &sk);
         #[cfg(fuzzing)]

src/schnorr.rs

@@ -470,7 +470,7 @@ mod tests {
             let kp = KeyPair::from_seckey_slice(&secp, &SK_BYTES).expect("sk");
 
             // In fuzzing mode secret->public key derivation is different, so
-            // hard-code the epected result.
+            // hard-code the expected result.
             kp.public_key()
         };
         #[cfg(fuzzing)]