Fix links in Gemini 3 Pro documentation (#13312)

Author: gmackall

docs/cli/model.md

@@ -25,10 +25,10 @@ Running this command will open a dialog with your model options:
 
 Note: Gemini 3 is not currently available on all account types. To learn more
 about Gemini 3 access, refer to
-[Gemini 3 Pro on Gemini CLI](../get-started/gemini-3).
+[Gemini 3 Pro on Gemini CLI](../get-started/gemini-3.md).
 
 To enable Gemini 3 Pro (if available), enable
-[**Preview features** by using the `settings` command](../cli/settings). Once
+[**Preview features** by using the `settings` command](../cli/settings.md). Once
 enabled, Gemini CLI will attempt to use Gemini 3 Pro when you select **Auto** or
 **Pro**. Both **Auto** and **Pro** will try to use Gemini 3 Pro before falling
 back to Gemini 2.5 Pro.

docs/get-started/gemini-3.md

@@ -30,7 +30,7 @@ standard, and free tier users.
 
 Note: Whether you’re automatically granted access or accepted from the waitlist,
 you’ll still need to enable Gemini 3 Pro
-[using the `/settings` command](../cli/settings).
+[using the `/settings` command](../cli/settings.md).
 
 ## How to join the waitlist
 
@@ -58,7 +58,7 @@ access–you still need to enable Gemini 3 Pro within Gemini CLI.
 To enable Gemini 3 Pro, use the `/settings` command in Gemini CLI and set
 **Preview Features** to `true`.
 
-For more information, see [Gemini CLI Settings](../cli/settings).
+For more information, see [Gemini CLI Settings](../cli/settings.md).
 
 ### Usage limits and fallback