fix: Satisfy checkstyle, make spelling consistent

Signed-off-by: Ryan Roberts <[email protected]>

sawtooth-daml-rpc/src/main/java/com/blockchaintp/sawtooth/daml/rpc/AuthorizationHeaderMissing.java

@@ -3,9 +3,12 @@
 import java.io.IOException;
 
 /**
- * Indicates a missing authorisation header
+ * Indicates a missing authorization header.
  */
 public class AuthorizationHeaderMissing extends IOException {
+    /**
+     * There is no authorization header.
+     */
     public AuthorizationHeaderMissing() {
         super("Authorization header not present");
     }