Fix incorrect plan availability for CCA (#60959)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: timrogers <116134+timrogers@users.noreply.github.com>
Co-authored-by: mc <42146119+mchammer01@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: 4 people

content/copilot/how-tos/copilot-on-github/customize-copilot/customize-copilot-overview.md

@@ -14,7 +14,7 @@ This quickstart walks you through customizing {% data variables.product.prodname
 
 ## Prerequisites
 
-* A {% data variables.product.prodname_copilot_short %} plan that includes {% data variables.copilot.copilot_cloud_agent %} ({% data variables.copilot.copilot_pro_plus %}, {% data variables.copilot.copilot_business_short %}, or {% data variables.copilot.copilot_enterprise_short %}). For more information, see [AUTOTITLE](/copilot/about-github-copilot/subscription-plans-for-github-copilot).
+* A {% data variables.product.prodname_copilot_short %} plan that includes {% data variables.copilot.copilot_cloud_agent %} ({% data variables.copilot.copilot_pro_short %}, {% data variables.copilot.copilot_pro_plus_short %}, {% data variables.copilot.copilot_business_short %}, or {% data variables.copilot.copilot_enterprise_short %}). For more information, see [AUTOTITLE](/copilot/about-github-copilot/subscription-plans-for-github-copilot).
 * {% data variables.copilot.copilot_cloud_agent_short_cap_c %} enabled for your organization or account. For more information, see [AUTOTITLE](/copilot/concepts/agents/cloud-agent/access-management).
 * Write access to a {% data variables.product.github %} repository.
 

data/reusables/copilot/optional-select-custom-agent-dotcom.md

@@ -1,2 +1,2 @@
 1. Optionally, you can click {% octicon "copilot" aria-hidden="true" aria-label="copilot" %} to open the agent dropdown menu, if you want to assign an agent or a {% data variables.copilot.copilot_custom_agent_short %} with specialized behavior and tools. You can select an existing {% data variables.copilot.copilot_custom_agent_short %} from your repository, organization, or enterprise. You can also click **{% octicon "plus" aria-label="Plus button" %} Create an agent** to create a new {% data variables.copilot.agent_profile %} in your selected repository and branch. For more information, see [AUTOTITLE](/copilot/how-tos/use-copilot-agents/cloud-agent/create-custom-agents).
-    > [!NOTE] Third-party coding agents are available in the {% data variables.copilot.copilot_pro_plus %} and {% data variables.copilot.copilot_enterprise_short %} plans.
+    > [!NOTE] {% data reusables.gated-features.third-party-agents %}