docs: update docs

README.md

@@ -15,8 +15,8 @@ in the [observability-docs](https://github.com/elastic/observability-docs) repo.
 
 ### Changelog
 
-The changelog for the Elastic Agent is generated and maintained using the [elastic-agent-changelog-tool](https://github.com/elastic/elastic-agent-changelog-tool). Read the [installation](https://github.com/elastic/elastic-agent-changelog-tool/blob/main/docs/install.md)
-and [usage](https://github.com/elastic/elastic-agent-changelog-tool/blob/main/docs/usage.md#im-a-developer) instructions to get started.
+The changelog for the Elastic Agent is generated and maintained using the [elastic-agent-changelog-tool](https://github.com/elastic/elastic-agent-changelog-tool). Read the [installation](https://github.com/elastic/elastic-agent-changelog-tool/blob/8.12/docs/install.md)
+and [usage](https://github.com/elastic/elastic-agent-changelog-tool/blob/8.12/docs/usage.md#im-a-developer) instructions to get started.
 
 The changelog tool produces fragement files that are consolidated to generate a changelog for each release. Each PR containing a change with user
 impact (new feature, bug fix, etc.) must contain a changelog fragement describing the change. There is a GitHub action in CI that will fail
@@ -36,7 +36,7 @@ pr: https://github.com/elastic/elastic-agent/pull/823
 Prerequisites:
 - installed [mage](https://github.com/magefile/mage)
 - [Docker](https://docs.docker.com/get-docker/)
-- [X-pack](https://github.com/elastic/beats/tree/main/x-pack) to pre-exist in the parent folder of the local Git repository checkout
+- [X-pack](https://github.com/elastic/beats/tree/8.12/x-pack) to pre-exist in the parent folder of the local Git repository checkout
 - [elastic-agent-changelog-tool](https://github.com/elastic/elastic-agent-changelog-tool) to add changelog fragments for changelog generation
 
 To build a local version of the agent for development, run the command below. The following platforms are supported:
@@ -89,10 +89,10 @@ for the standard variant.
 ### Testing Elastic Agent on Kubernetes
 
 #### Prerequisites
-- create kubernetes cluster using kind, check [here](https://github.com/elastic/beats/blob/main/metricbeat/module/kubernetes/_meta/test/docs/README.md) for details
-- deploy kube-state-metrics, check [here](https://github.com/elastic/beats/blob/main/metricbeat/module/kubernetes/_meta/test/docs/README.md) for details
+- create kubernetes cluster using kind, check [here](https://github.com/elastic/beats/blob/8.12/metricbeat/module/kubernetes/_meta/test/docs/README.md) for details
+- deploy kube-state-metrics, check [here](https://github.com/elastic/beats/blob/8.12/metricbeat/module/kubernetes/_meta/test/docs/README.md) for details
 - deploy required infrastructure:
-    - for elastic agent in standalone mode: EK stack or use [elastic cloud](https://cloud.elastic.co), check [here](https://github.com/elastic/beats/blob/main/metricbeat/module/kubernetes/_meta/test/docs/README.md) for details
+    - for elastic agent in standalone mode: EK stack or use [elastic cloud](https://cloud.elastic.co), check [here](https://github.com/elastic/beats/blob/8.12/metricbeat/module/kubernetes/_meta/test/docs/README.md) for details
     - for managed mode: use [elastic cloud](https://cloud.elastic.co) or bring up the stack on docker and then connect docker network with kubernetes kind nodes:
   ```
   elastic-package stack up -d -v

version/docs/version.asciidoc

@@ -1,4 +1,4 @@
-:stack-version: 8.8.1
+:stack-version: 8.12.0
 :doc-branch: main
 // FIXME: once elastic.co docs have been switched over to use `main`, remove
 // the `doc-site-branch` line below as well as any references to it in the code.