Update release_notes.txt (#2842)

release_notes.txt

@@ -8,13 +8,6 @@ Metadata changes:
    974 (en)
  - Updated / refreshed time zone meta data.
 
-Errors:
-  - At this version, [Java demo portal's WAR file](https://repo1.maven.org/maven2/com/googlecode/libphonenumber/demo/8.12.57/)
-    do not work when deployed in live AppEngine server, however it works when deployed and
-    run in local AppEngine server. This issue will be fixed soon. PR#2834
-  - [Java demo portal](https://libphonenumber.appspot.com/) is still at version 8.12.57.
-    So we recommend to use [JS demo portal](https://htmlpreview.github.io/?https://github.com/google/libphonenumber/blob/master/javascript/i18n/phonenumbers/demo-compiled.html) as new metadata updates are missing there.
-
 Sep 22, 2022: v8.12.56
 Metadata changes:
  - Updated phone metadata for region code(s): HR, MK, PT, SG, TT