docs: fix typo in metrics (#1008)

Author: mvisonneau

docs/metrics.md

@@ -30,7 +30,7 @@
 | `gitlab_ci_pipeline_job_queued_duration_seconds` | Duration in seconds the most recent job has been queued before starting | [project], [topics], [ref], [runner_description], [kind], [source], [variables], [stage], [job_name], [tag_list], [failure_reason] | `project_defaults.pull.pipeline.jobs.enabled` |
 | `gitlab_ci_pipeline_job_run_count` | Number of executions of a job | [project], [topics], [ref], [runner_description], [kind], [source], [variables], [stage], [job_name], [tag_list], [failure_reason] | `project_defaults.pull.pipeline.jobs.enabled` |
 | `gitlab_ci_pipeline_job_status` | Status of the most recent job | [project], [topics], [ref], [runner_description], [kind], [source], [variables], [stage], [job_name], [tag_list], [status], [failure_reason] | `project_defaults.pull.pipeline.jobs.enabled` |
-| `gitlab_ci_pipeline_job_timestamp` | Creation date timestamp of the the most recent job | [project], [topics], [ref], [runner_description], [kind], [source], [variables], [stage], [job_name], [tag_list], [failure_reason] | `project_defaults.pull.pipeline.jobs.enabled` |
+| `gitlab_ci_pipeline_job_timestamp` | Creation date timestamp of the most recent job | [project], [topics], [ref], [runner_description], [kind], [source], [variables], [stage], [job_name], [tag_list], [failure_reason] | `project_defaults.pull.pipeline.jobs.enabled` |
 | `gitlab_ci_pipeline_queued_duration_seconds` | Duration in seconds the most recent pipeline has been queued before starting | [project], [topics], [ref], [kind], [source], [variables] | *available by default* |
 | `gitlab_ci_pipeline_run_count` | Number of executions of a pipeline | [project], [topics], [ref], [kind], [source], [variables] | *available by default* |
 | `gitlab_ci_pipeline_status` | Status of the most recent pipeline | [project], [topics], [ref], [kind], [source], [variables], [status] | *available by default* |