[Copilot] Remove note about Grok model promo period (#59658)

Co-authored-by: Vanessa <vgrl@github.com>

Author: crwaters16

content/copilot/reference/ai-models/model-comparison.md

@@ -25,8 +25,6 @@ contentType: reference
 
 ### Recommended models by task
 
-{% data reusables.copilot.grok-promo-period %}
-
 Use this table to find a suitable model quickly, see more detail in the sections below.
 
 

content/copilot/reference/ai-models/model-hosting.md

@@ -86,8 +86,6 @@ When using {% data variables.copilot.copilot_gemini %} models, input prompts and
 
 ## xAI models
 
-{% data reusables.copilot.grok-promo-period %}
-
 These models are hosted on xAI. xAI operates {% data variables.copilot.copilot_grok_code %} in {% data variables.product.prodname_copilot %} under a zero data retention API policy. This means xAI commits that user content (both inputs sent to the model and outputs generated by the model):
 
 Will **not** be:

content/copilot/reference/ai-models/supported-models.md

@@ -37,8 +37,6 @@ For all of the default AI models, input prompts and output completions run throu
 
 This table lists the AI models available in {% data variables.product.prodname_copilot_short %}, along with their release status and availability in different modes.
 
-{% data reusables.copilot.grok-promo-period %}
-
 {% rowheaders %}
 
 | Model name                                             | Provider  | Release status             | Agent mode | Ask mode | Edit mode |