chore(platform_env): add warn prefix to docs (#9269)

### Description

Update logs

### Testing Instructions

<!--
  Give a quick description of steps to test your changes.
-->

crates/turborepo-env/src/platform.rs

@@ -61,33 +61,31 @@ impl PlatformEnv {
  cache hits."
  };
 
+ let docs_message = color!(
+ color_config,
+ UNDERLINE,
+ "https://turbo.build/repo/docs/platform-environment-variables"
+ );
+
  match ci {
  "VERCEL" => {
  ceprintln!(
  color_config,
  BOLD,
  "Warning - the following environment variables are set on your Vercel \
- project, but missing from \"turbo.json\". {}",
- strict_message
+ project, but missing from \"turbo.json\". {strict_message} Learn more at \
+  {docs_message}\n"
  );
  }
  _ => {
  ceprintln!(
  color_config,
  BOLD,
  "Warning - the following environment variables are missing from \
- \"turbo.json\". {}",
- strict_message
+ \"turbo.json\". {strict_message} Learn more at {docs_message}\n"
  );
  }
  }
-
- let docs = color!(
- color_config,
- UNDERLINE,
- "https://turbo.build/repo/docs/platform-environment-variables"
- );
- ceprintln!(color_config, GREY, "Learn more at {docs}\n");
  }
 
  pub fn output_for_task(