Typos a/an (#13846)

bundles/org.openhab.binding.dscalarm/src/main/java/org/openhab/binding/dscalarm/internal/DSCAlarmMessage.java

@@ -323,7 +323,7 @@ public class DSCAlarmMessage {
     }
 
     /**
-     * Returns a string representation of a APIMessage.
+     * Returns a string representation of an APIMessage.
      *
      * @return APIMessage string
      */

bundles/org.openhab.binding.dscalarm/src/main/java/org/openhab/binding/dscalarm/internal/handler/DSCAlarmThingType.java

@@ -16,7 +16,7 @@ import java.util.HashMap;
 import java.util.Map;
 
 /**
- * Used to map thing types from the binding string to a ENUM value.
+ * Used to map thing types from the binding string to an ENUM value.
  *
  * @author Russell Stephens - Initial Contribution
  */