Doc Consistency: api/templates

doc/api/templates/dockerfiles.md

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-# Dockerfiles API
+# Dockerfiles API **(FREE)**
 
 GitLab provides an API endpoint for instance-level Dockerfile templates.
 Default templates are defined at

doc/api/templates/gitignores.md

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-# .gitignore API
+# .gitignore API **(FREE)**
 
 In GitLab, the `/gitignores` endpoint returns a list of Git `.gitignore` templates. For more information,
 see the [Git documentation for `.gitignore`](https://git-scm.com/docs/gitignore).

doc/api/templates/gitlab_ci_ymls.md

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-# GitLab CI YMLs API
+# GitLab CI YMLs API **(FREE)**
 
 In GitLab, there is an API endpoint available to work with GitLab CI/CD YMLs. For more
 information on CI/CD pipeline configuration in GitLab, see the

doc/api/templates/licenses.md

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-# Licenses API
+# Licenses API **(FREE)**
 
 In GitLab, there is an API endpoint available for working with various open
 source license templates. For more information on the terms of various