doc(release note): Add release note for Centreon Web 2.8.21 version (#6196)

* doc(release note): Add release note for Centreon Web 2.8.21 version

* fix(release note): Revert jquery-ui commit to release 2.8.21

doc/en/release_notes/centreon-2.8/centreon-2.8.21.rst

@@ -5,5 +5,17 @@ Centreon Web 2.8.21
 Enhancements
 ============
 
+* [Documentation] Add chapter about how to write a stream connector - PR #6189
+* [API] Separate REST API configuration and REST API realtime access - PR #6188
+
 Bug Fixes
 =========
+
+* [ACL] Manage filters (poller, host, service) on servicegroup - PR #6163
+* [Configuration] Fix output stream connector name for fresh install - PR #6159 #6182
+* [Configuration] No "Conf changed" flag set to "yes" when deploying services to selected hosts - #6160 PR #6191
+
+Other
+=====
+
+* Fix php warning in realtime host API - PR #6174
\ No newline at end of file

doc/fr/release_notes/centreon-2.8/centreon-2.8.21.rst

@@ -5,5 +5,17 @@ Centreon Web 2.8.21
 Enhancements
 ============
 
+* [Documentation] Add chapter about how to write a stream connector - PR #6189
+* [API] Separate REST API configuration and REST API realtime access - PR #6188
+
 Bug Fixes
 =========
+
+* [ACL] Manage filters (poller, host, service) on servicegroup - PR #6163
+* [Configuration] Fix output stream connector name for fresh install - PR #6159 #6182
+* [Configuration] No "Conf changed" flag set to "yes" when deploying services to selected hosts - #6160 PR #6191
+
+Other
+=====
+
+* Fix php warning in realtime host API - PR #6174
\ No newline at end of file