Fix typo in OpenAI Codex Introduction (#42295)

Co-authored-by: Sharra-writes <sharra-writes@github.com>

Author: mikoflip

content/copilot/concepts/agents/openai-codex.md

@@ -15,7 +15,7 @@ contentType: concepts
 
 ## Introduction
 
-The {% data variables.product.prodname_openai_codex %} {% data variables.product.prodname_vscode_shortname %} extension can be powered by your existing {% data variables.product.prodname_copilot_short %} subscription. Use "Sign in with {% data variables.product.prodname_copilot_short %}" when launching the extension. {% data variables.product.prodname_copilot_short %} users can see this integration in the [Agent Sessions view](https://code.visualstudio.com/docs/copilot/chat/chat-sessions#_agent-sessions-view?ref_product=copilot&ref_type=engagement&ref_style=text) in {% data variables.product.prodname_vscode_shortname %} Insiders along with progress on their running tasks. All usage is subect to GitHub rate limits and billing. See [AUTOTITLE](/copilot/concepts/billing/copilot-requests#premium-features).
+The {% data variables.product.prodname_openai_codex %} {% data variables.product.prodname_vscode_shortname %} extension can be powered by your existing {% data variables.product.prodname_copilot_short %} subscription. Use "Sign in with {% data variables.product.prodname_copilot_short %}" when launching the extension. {% data variables.product.prodname_copilot_short %} users can see this integration in the [Agent Sessions view](https://code.visualstudio.com/docs/copilot/chat/chat-sessions#_agent-sessions-view?ref_product=copilot&ref_type=engagement&ref_style=text) in {% data variables.product.prodname_vscode_shortname %} Insiders along with progress on their running tasks. All usage is subject to GitHub rate limits and billing. See [AUTOTITLE](/copilot/concepts/billing/copilot-requests#premium-features).
 
 ## Model availability