updated subtitles / added new img

Author: GiselleNessi

apps/portal/src/app/account/billing/assets/rpc-settings.png

@@ -2,6 +2,7 @@ import { DocImage } from "@doc";
 import billingSettings from "../assets/billing-settings.png";
 import invoicesSettings from "../assets/invoices-settings.png";
 import usageSettings from "../assets/usage-settings.png";
+import rpcSettings from "../assets/rpc-settings.png";
 import storageSettings from "../assets/storage-settings.png";
 
 
@@ -49,15 +50,16 @@ To check your current usage and limits:
 1. Visit the **Usage** tab in your dashboard.
 2. The **Usage** tab is divided into two sections:
 
-### Overview
+#### Overview
    - Number of In-App Wallets created
    - Total sponsored fees for wallets with account abstraction enabled
    - Number of RPC requests
    - Number of Storage Gateway requests
 
 <DocImage src={usageSettings} />
+<DocImage src={rpcSettings} />
 
-### Storage
+#### Storage
    - Total size of files pinned
 
 <DocImage src={storageSettings} />