Typos a/an (#13819)

bundles/org.openhab.io.homekit/src/main/java/org/openhab/io/homekit/internal/accessories/HomekitAccessoryFactory.java

@@ -202,7 +202,7 @@ public class HomekitAccessoryFactory {
     }
 
     /**
-     * return HomeKit accessory types for a OH item based on meta data
+     * return HomeKit accessory types for an OH item based on meta data
      *
      * @param item OH item
      * @param metadataRegistry meta data registry
@@ -372,7 +372,7 @@ public class HomekitAccessoryFactory {
     }
 
     /**
-     * collect optional HomeKit characteristics for a OH item.
+     * collect optional HomeKit characteristics for an OH item.
      *
      * @param taggedItem main OH item
      * @param metadataRegistry OH metadata registry

bundles/org.openhab.io.homekit/src/main/java/org/openhab/io/homekit/internal/accessories/HomekitCharacteristicFactory.java

@@ -116,7 +116,7 @@ import io.github.hapjava.characteristics.impl.windowcovering.TargetVerticalTiltA
 import tech.units.indriya.unit.UnitDimension;
 
 /**
- * Creates a optional characteristics .
+ * Creates an optional characteristics .
  *
  * @author Eugen Freiter - Initial contribution
  */