Update about-self-hosted-runners.md

Fix duplicate list entry

Author: wil93

content/actions/hosting-your-own-runners/about-self-hosted-runners.md

@@ -60,7 +60,7 @@ There are some limits on {% data variables.product.prodname_actions %} usage whe
 {% data reusables.github-actions.usage-workflow-run-time %}
 - **Job queue time** - Each job for self-hosted runners can be queued for a maximum of 24 hours. If a self-hosted runner does not start executing the job within this limit, the job is terminated and fails to complete.
 {% data reusables.github-actions.usage-api-requests %}
-- **Job matrix** - {% data reusables.github-actions.usage-matrix-limits %}
+{% data reusables.github-actions.usage-matrix-limits %}
 
 ### Supported operating systems for self-hosted runners