Improve javadoc for some addons (#15701)

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

bundles/org.openhab.persistence.influxdb/src/main/java/org/openhab/persistence/influxdb/InfluxDBPersistenceService.java

@@ -71,8 +71,8 @@ import org.slf4j.LoggerFactory;
 
 /**
  * This is the implementation of the InfluxDB {@link PersistenceService}. It
- * persists item values using the <a href="http://influxdb.org">InfluxDB time
- * series database. The states ( {@link State}) of an {@link Item} are persisted
+ * persists item values using the <a href="http://influxdb.org">InfluxDB</a> time
+ * series database. The states ({@link State}) of an {@link Item} are persisted
  * by default in a time series with names equal to the name of the item.
  *
  * This addon supports 1.X and 2.X versions, as two versions are incompatible

bundles/org.openhab.persistence.influxdb/src/main/java/org/openhab/persistence/influxdb/internal/InfluxDBRepository.java

@@ -55,7 +55,7 @@ public interface InfluxDBRepository {
     /**
      * Return all stored item names with its count of stored points
      *
-     * @return Map with <ItemName,ItemCount> entries
+     * @return Map with {@code <ItemName,ItemCount>} entries
      */
     Map<String, Integer> getStoredItemsCount();