[Docs] Updated Release Notes docs for 8.2 (#1895)

Author: kgeller

docs/release-notes/8.2.asciidoc

@@ -1,4 +1,41 @@
 [[ecs-release-notes-8.2.0]]
 === 8.2.0
 
-coming[8.2.0]
+[[schema-changes-8.2.0]]
+[float]
+==== Schema changes
+
+[[schema-added-8.2.0]]
+[float]
+===== Added
+
+* Add beta `container.*` metric fields. {ecs_pull}1789[#1789]
+* Add six new syslog fields to `log.syslog.*`. {ecs_pull}1793[#1793]
+* Added `faas.id`, `faas.name` and `faas.version` fields as beta. {ecs_pull}1796[#1796]
+* Added linux event model beta fields and reuses to support RFC 0030. {ecs_pull}1842[#1842], {ecs_pull}1847[#1847], {ecs_pull}1884[#1884]
+* Added `threat.feed.dashboard_id`, `threat.feed.description`, `threat.feed.name`, `threat.feed.reference` fields. {ecs_pull}1844[#1844]
+
+[[schema-improvements-8.2.0]]
+[float]
+===== Improvements
+
+* `email.*` field set now GA. {ecs_pull}1794[#1794], {ecs_pull}1841[#1841]
+
+[[tooling-changes-8.2.0]]
+[float]
+==== Tooling and artifact changes
+
+[[tooling-added-8.2.0]]
+[float]
+===== Added
+
+* Adding optional field attribute, `pattern`. {ecs_pull}1834[#1834]
+* Added support for re-using a fieldset as an array. {ecs_pull}1838[#1838]
+* Added `--force-docs` option to generator. {ecs_pull}1879[#1879]
+
+[[tooling-improvements-8.2.0]]
+[float]
+===== Improvements
+* Update refs from master to main in USAGE.md etc {ecs_pull}1658[#1658]
+* Clean up trailing spaces and additional newlines in schemas {ecs_pull}1667[#1667]
+* Use higher compression as default in composable index template settings. {ecs_pull}1712[#1712]