Replace single-tab code block title with bolded label (#44)

The Step 2 IAM policy code block on the Bring your own LLM page used a
title= attribute, which Astro Starlight renders as a single tab on top
of the code block. The style guide reserves title= for actual filenames
(e.g., title="config.yaml"), so this off-pattern usage looked like a
vestigial tab strip.

Drop the title attribute and add a bolded label line above the fence
instead. Repo-wide audit confirmed this was the only occurrence.

Co-authored-by: Oz <oz-agent@warp.dev>

Author: hongyi-chen

src/content/docs/enterprise/enterprise-features/bring-your-own-llm.mdx

@@ -81,7 +81,9 @@ In the [Admin Panel](/enterprise/team-management/admin-panel/), configure which
 
 Grant your team members the necessary permissions in AWS. Use least-privilege IAM policies.
 
-```json title="Example: AWS Bedrock minimum IAM policy"
+**Example: AWS Bedrock minimum IAM policy**
+
+```json
 {
   "Version": "2012-10-17",
   "Statement": [