Add tier badges to API docs

Add tier badging to Pipeline Execution API docs.

doc/api/jobs.md

@@ -4,7 +4,7 @@ group: Pipeline Execution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# Jobs API
+# Jobs API **(FREE)**
 
 ## List project jobs
 

doc/api/lint.md

@@ -4,12 +4,10 @@ group: Pipeline Execution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# CI Lint API
+# CI Lint API **(FREE)**
 
 ## Validate the CI YAML configuration
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5953) in GitLab 8.12.
-
 Checks if CI/CD YAML configuration is valid. This endpoint validates basic CI/CD
 configuration syntax. It doesn't have any namespace specific context.
 

doc/api/pipeline_schedules.md

@@ -4,7 +4,7 @@ group: Pipeline Execution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# Pipeline schedules API
+# Pipeline schedules API **(FREE)**
 
 You can read more about [pipeline schedules](../ci/pipelines/schedules.md).
 
@@ -317,8 +317,6 @@ Example response:
 
 ## Pipeline schedule variables
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/34518) in GitLab 10.0.
-
 ## Create a new pipeline schedule variable
 
 Create a new variable of a pipeline schedule.

doc/api/pipeline_triggers.md

@@ -4,7 +4,7 @@ group: Pipeline Execution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# Pipeline triggers API
+# Pipeline triggers API **(FREE)**
 
 You can read more about [triggering pipelines through the API](../ci/triggers/README.md).
 

doc/api/pipelines.md

@@ -4,7 +4,7 @@ group: Pipeline Execution
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
 ---
 
-# Pipelines API
+# Pipelines API **(FREE)**
 
 ## Single Pipeline Requests
 
@@ -23,8 +23,6 @@ Read more on [pagination](README.md#pagination).
 
 ## List project pipelines
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5837) in GitLab 8.11
-
 ```plaintext
 GET /projects/:id/pipelines
 ```
@@ -77,8 +75,6 @@ Example of response
 
 ## Get a single pipeline
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5837) in GitLab 8.11
-
 ```plaintext
 GET /projects/:id/pipelines/:pipeline_id
 ```
@@ -213,8 +209,6 @@ Sample response:
 
 ## Create a new pipeline
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/7209) in GitLab 8.14
-
 ```plaintext
 POST /projects/:id/pipeline
 ```
@@ -263,8 +257,6 @@ Example of response
 
 ## Retry jobs in a pipeline
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5837) in GitLab 8.11
-
 ```plaintext
 POST /projects/:id/pipelines/:pipeline_id/retry
 ```
@@ -312,8 +304,6 @@ Response:
 
 ## Cancel a pipeline's jobs
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5837) in GitLab 8.11
-
 ```plaintext
 POST /projects/:id/pipelines/:pipeline_id/cancel
 ```