Fix a typo in SLHDSA

Author: gefeili

core/src/main/java/org/bouncycastle/pqc/crypto/slhdsa/HashSLHDSASigner.java

@@ -19,7 +19,7 @@
 import org.bouncycastle.util.Arrays;
 
 /**
- * SLH-DA signer.
+ * SLH-DSA signer.
  */
 public class HashSLHDSASigner
     implements Signer

core/src/main/java/org/bouncycastle/pqc/crypto/slhdsa/SLHDSASigner.java

@@ -9,7 +9,7 @@
 import org.bouncycastle.util.Arrays;
 
 /**
- * SLH-DA signer.
+ * SLH-DSA signer.
  * <p>
  * This version is based on the 3rd submission with deference to the updated reference
  * implementation on github as at November 9th 2021. This version includes the changes