fix comment

addFile() is not called from indexDown(). It is called from indexParallel() for IndexFileWork instances collected in indexDown().

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/index/IndexDatabase.java

@@ -1271,7 +1271,7 @@ private void indexDown(File dir, String parent, IndexDownArgs args)
 
                             // If the term's path matches path of currently processed file,
                             // it is clear that the file has been modified and thus
-                            // removeFile() will be followed by call to addFile() below.
+                            // removeFile() will be followed by call to addFile() in indexParallel().
                             // In such case, instruct removeFile() not to remove history
                             // cache for the file so that incremental history cache
                             // generation works.