add comment

Author: Vladimir Kotal

opengrok-indexer/src/main/java/org/opengrok/indexer/history/MercurialRepository.java

@@ -82,7 +82,7 @@ public class MercurialRepository extends RepositoryWithPerPartesHistory {
     static final String END_OF_ENTRY
             = "mercurial_history_end_of_entry";
 
-    private static final String TEMPLATE_REVS = "{rev}:\\n";
+    private static final String TEMPLATE_REVS = "{rev}:\\n"; // use colon so that getRevisionNum() works
     private static final String TEMPLATE_STUB
             = CHANGESET + "{rev}:{node|short}\\n"
             + USER + "{author}\\n" + DATE + "{date|isodate}\\n"