[Improvement]: Make it clear to users that signing up to a paid Copilot plan doesn't give unlimited access to the preview models (#54551)

Author: sophietheking

content/copilot/about-github-copilot/subscription-plans-for-github-copilot.md

@@ -11,7 +11,7 @@ shortTitle: Subscriptions
 {% data variables.product.company_short %} offers multiple subscription options for {% data variables.product.prodname_copilot %}:
 
 * **{% data variables.product.prodname_copilot_free %}** is available to individual {% data variables.product.company_short %} customers who don't have access to {% data variables.product.prodname_copilot_short %} through an organization or enterprise. This free tier provides limited access to select features of {% data variables.product.prodname_copilot_short %}, allowing you to experience AI-powered coding assistance without a subscription.
-* **{% data variables.product.prodname_copilot_pro %}** is available to individual {% data variables.product.company_short %} customers who don't have access to {% data variables.product.prodname_copilot_short %} through an organization or enterprise. This paid tier offers full access to all {% data variables.product.prodname_copilot_short %} features, including advanced capabilities and unlimited usage, for a comprehensive AI coding experience.
+* **{% data variables.product.prodname_copilot_pro %}** is available to individual {% data variables.product.company_short %} customers who don't have access to {% data variables.product.prodname_copilot_short %} through an organization or enterprise. This paid tier offers full access to all {% data variables.product.prodname_copilot_short %} features, including advanced capabilities, for a comprehensive AI coding experience. While standard {% data variables.product.prodname_copilot_short %} usage is unlimited, models within {% data variables.product.prodname_copilot_short %} that are currently in public preview are subject to changes, rate limits, and evolving performance. For details, see [AUTOTITLE](/github-models/prototyping-with-ai-models#rate-limits).
 * **{% data variables.product.prodname_copilot_for_business %}** is available for organizations with a {% data variables.product.prodname_free_team %} or {% data variables.product.prodname_team %} plan, or enterprises on {% data variables.product.prodname_ghe_cloud %}. {% data variables.product.prodname_copilot_business_short %} gives organizations and enterprises control over {% data variables.product.prodname_copilot_short %} policies, including which members can use {% data variables.product.prodname_copilot_short %}.
 * **{% data variables.product.prodname_copilot_enterprise %}** is available for enterprises on {% data variables.product.prodname_ghe_cloud %}. In addition to all of the {% data variables.product.prodname_copilot_business_short %} features, {% data variables.product.prodname_copilot_enterprise_short %} provides additional AI features on {% data variables.product.company_short %}. With this subscription plan you can choose to assign either {% data variables.product.prodname_copilot_enterprise_short %} or {% data variables.product.prodname_copilot_business_short %} to each individual organization in the enterprise.