fix: adds note for copilot docs

If you have a file open, when running `codegate version`, you get a response based on the file and not the codegate version itself. I've added a note to inform users that they close all files before running the command.
Outside of this PR, we may want to decide if this is desired functionality by Copilot or Codegate and if the version should be returned regardless if a file is currently open or not.

Author: ChrisJBurns

docs/integrations/copilot.mdx

@@ -234,6 +234,12 @@ To verify that you've successfully connected Copilot to CodeGate, open the
 Copilot chat and type `codegate version`. You should receive a response like
 "CodeGate version 0.1.13".
 
+:::note
+
+Make sure you have no open files when running the `codegate version` command, otherwise Copilot will make comments based on the file you have open.
+
+:::
+
 <ThemedImage
   alt='Verify Copilot integration'
   sources={{