Update pricing.mdx

clarify this faq is specifically pricing faq

Author: kathayl

src/content/docs/browser-rendering/platform/pricing.mdx

@@ -40,7 +40,7 @@ For **concurrent browsers**:
 For **browser duration** and **concurrent browsers**:
 <br/>$3.60 + $10.00 = $13.60
 
-## FAQ
+## Pricing FAQ
 
 ### How do I estimate my Browser Rendering costs?