Adding release notes for ECS 8.10 (#2274)

docs/release-notes/8.10.asciidoc

@@ -0,0 +1,31 @@
+[[ecs-release-notes-8.10.0]]
+=== 8.10.0
+
+[[schema-changes-8.10.0]]
+[float]
+==== Schema changes
+
+[[schema-added-8.10.0]]
+[float]
+===== Added
+
+* Added `container.security_context.privileged` to indicated whether a container was started in privileged mode. {ecs_pull}2219[#2219], {ecs_pull}2225[#2225], {ecs_pull}2246[#2246]
+* Added `process.thread.capabilities.permitted` to contain the current thread's possible capabilities. {ecs_pull}2245[#2245]
+* Added `process.thread.capabilities.effective` to contain the current thread's effective capabilities. {ecs_pull}2245[#2245]
+
+[[schema-improvements-8.10.0]]
+[float]
+===== Improvements
+
+* Permit `ignore_above` if explicitly set on a `flattened` field. {ecs_pull}2248[#2248]
+
+[[tooling-changes-8.10.0]]
+[float]
+==== Tooling and artifact changes
+
+[[tooling-improvements-8.10.0]]
+[float]
+===== Improvements
+
+* Improved documentation formatting to better follow the contributing guide. {ecs_pull}2226[#2226]
+* Bump `gitpython` dependency from 3.1.30 to 3.1.35 for security fixes. {ecs_pull}2251[#2251], {ecs_pull}2264[#2264], {ecs_pull}2265[#2265]

docs/release-notes/index.asciidoc

@@ -3,6 +3,7 @@
 
 This section summarizes the changes in each release.
 
+* <<ecs-release-notes-8.10.0, {ecs} version 8.10.0>>
 * <<ecs-release-notes-8.9.0, {ecs} version 8.9.0>>
 * <<ecs-release-notes-8.8.0, {ecs} version 8.8.0>>
 * <<ecs-release-notes-8.7.0, {ecs} version 8.7.0>>
@@ -25,6 +26,7 @@ This section summarizes the changes in each release.
 :issue: https://github.com/elastic/ecs/issues/
 :pull: https://github.com/elastic/ecs/pull/
 
+include::8.10.asciidoc[]
 include::8.9.asciidoc[]
 include::8.8.asciidoc[]
 include::8.7.asciidoc[]