fixes for javadoc issues.

Author: rernas35

clickhouse-r2dbc/src/main/java/com/clickhouse/r2dbc/ClickHouseResult.java

@@ -47,7 +47,7 @@ public class ClickHouseResult implements Result {
 
     /**
      * Returns updated count(written rows from summary of {@link ClickHouseResponse}).Important! if writtenRows is greater than MAX_INT then it will return MAX_INT.
-     * @return
+     * @return updated count
      */
     @Override
     public Mono<Long> getRowsUpdated() {

clickhouse-r2dbc/src/main/java/com/clickhouse/r2dbc/connection/ClickHouseConnection.java

@@ -165,7 +165,7 @@ public Publisher<Void> setStatementTimeout(Duration duration) {
 
     /**
      * Since transactions are not supported, this method will throw exception.
-     * @param isolationLevel @{{@link IsolationLevel}}
+     * @param isolationLevel isolation level for transaction
      */
     @Override
     public Mono<Void> setTransactionIsolationLevel(IsolationLevel isolationLevel) {