Revert "[April 13] serialization feature doc (#18606)" (#18739)

This reverts commit 2c881b6.

Author: Sarah Edwards

content/actions/reference/environments.md

@@ -71,9 +71,6 @@ For more information on syntax to reference environments in workflows, see "[Wor
 
 When a workflow references an environment, the environment will appear in the repository's deployments. For more information about viewing current and previous deployments, see "[Viewing deployment history](/developers/overview/viewing-deployment-history)."
 
-### Using concurrency to serialize deployments in an environment
-You can use concurrency so that an environment has a maximum of one deployment in progress and one deployment pending at a time. For more information, see "[Workflow syntax for GitHub Actions](/actions/reference/workflow-syntax-for-github-actions#concurrency)."
-
 ### Deleting an environment
 
 {% data reusables.github-actions.permissions-statement-environment %}

content/actions/reference/workflow-syntax-for-github-actions.md

@@ -221,18 +221,6 @@ defaults:
     working-directory: scripts
 ```
 
-{% if currentVersion == "free-pro-team@latest" or currentVersion ver_gt "enterprise-server@3.0" or currentVersion == "github-ae@next" %}
-### `concurrency`
-
-{% data reusables.actions.concurrency-beta %}
-
-Concurrency ensures that only a single job or workflow using the same concurrency group will run at a time. A concurrency group can be any string or expression. The expression can only use the `github` context. For more information about expressions, see "[Context and expression syntax for {% data variables.product.prodname_actions %}](/actions/reference/context-and-expression-syntax-for-github-actions)."
-
-You can also specify `concurrency` at the job level. For more information, see [`jobs.<job_id>.concurrency`](/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#jobsjob_idconcurrency).
-
-{% data reusables.actions.actions-group-concurrency %}
-
-{% endif %}
 ### `jobs`
 
 A workflow run is made up of one or more jobs. Jobs run in parallel by default. To run jobs sequentially, you can define dependencies on other jobs using the `jobs.<job_id>.needs` keyword.
@@ -356,14 +344,13 @@ For more information, see "[About self-hosted runners](/github/automating-your-w
 
 The environment that the job references. All environment protection rules must pass before a job referencing the environment is sent to a runner. For more information, see "[Environments](/actions/reference/environments)."
 
-You can provide the environment as only the environment `name`, or as an environment object with the `name` and `url`. We support [context and expression syntax for {% data variables.product.prodname_actions %}](/actions/reference/context-and-expression-syntax-for-github-actions) only when you provide the environment object. The URL maps to `environment_url` in the deployments API. For more information about the deployments API, see "[Deployments](/rest/reference/repos#deployments)."
+You can provide the environment as only the environment `name`, or as an environment object with the `name` and `url`. The URL maps to `environment_url` in the deployments API. For more information about the deployments API, see "[Deployments](/rest/reference/repos#deployments)."
 
 ##### Example using a single environment name
-{% raw %}
+
 ```yaml
 environment: staging_environment
 ```
-{% endraw %}
 
 ##### Example using environment name and URL
 
@@ -385,25 +372,6 @@ environment:
 {% endraw %}
 {% endif %}
 
-
-{% if currentVersion == "free-pro-team@latest" or currentVersion ver_gt "enterprise-server@3.0" or currentVersion == "github-ae@next" %}
-### `jobs.<job_id>.concurrency`
-
-{% data reusables.actions.concurrency-beta %}
-
-{% note %}
-
-**Note:** When concurrency is specified at the job level, order is not guaranteed for jobs or runs that queue within 5 minutes of each other.
-
-{% endnote %}
-
-Concurrency ensures that only a single job or workflow using the same concurrency group will run at a time. A concurrency group can be any string or expression. The expression can use any context except for the `secrets` context. For more information about expressions, see "[Context and expression syntax for {% data variables.product.prodname_actions %}](/actions/reference/context-and-expression-syntax-for-github-actions)."
-
-You can also specify `concurrency` at the workflow level. For more information, see [`concurrency`](/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions#concurrency).
-
-{% data reusables.actions.actions-group-concurrency %}
-
-{% endif %}
 ### `jobs.<job_id>.outputs`
 
 A `map` of outputs for a job. Job outputs are available to all downstream jobs that depend on this job. For more information on defining job dependencies, see [`jobs.<job_id>.needs`](#jobsjob_idneeds).